diff --git a/package.json b/package.json
index 4507d02..b1479cc 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "chai": "^3.5.0",
     "coveralls": "^2.11.9",
     "istanbul": "^0.4.3",
-    "jsdom": "^11.6.2",
+    "jsdom": "^15.2.1",
     "mocha": "^2.5.3",
     "mocha-lcov-reporter": "^1.2.0",
     "mock-raf": "^1.0.0",
diff --git a/yarn.lock b/yarn.lock
index 2c31df9..72dc7fd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9,10 +9,6 @@ JSONStream@^1.0.3:
     jsonparse "^1.2.0"
     through ">=2.2.7 <3"
 
-abab@^1.0.4:
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/abab/-/abab-1.0.4.tgz#5faad9c2c07f60dd76770f71cf025b62a63cfd4e"
-
 abab@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/abab/-/abab-2.0.0.tgz#aba0ab4c5eee2d4c79d3487d85450fb2376ebb0f"
@@ -31,11 +27,12 @@ acorn-dynamic-import@^3.0.0:
   dependencies:
     acorn "^5.0.0"
 
-acorn-globals@^4.1.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-4.1.0.tgz#ab716025dbe17c54d3ef81d32ece2b2d99fe2538"
+acorn-globals@^4.3.2:
+  version "4.3.4"
+  resolved "https://registry.yarnpkg.com/acorn-globals/-/acorn-globals-4.3.4.tgz#9fa1926addc11c97308c4e66d7add0d40c3272e7"
   dependencies:
-    acorn "^5.0.0"
+    acorn "^6.0.1"
+    acorn-walk "^6.0.1"
 
 acorn-node@^1.2.0, acorn-node@^1.3.0, acorn-node@^1.5.2:
   version "1.5.2"
@@ -45,10 +42,22 @@ acorn-node@^1.2.0, acorn-node@^1.3.0, acorn-node@^1.5.2:
     acorn-dynamic-import "^3.0.0"
     xtend "^4.0.1"
 
-acorn@^5.0.0, acorn@^5.5.3, acorn@^5.7.1:
+acorn-walk@^6.0.1:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.2.0.tgz#123cb8f3b84c2171f1f7fb252615b1c78a6b1a8c"
+
+acorn@^5.0.0, acorn@^5.7.1:
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.1.tgz#f095829297706a7c9776958c0afc8930a9b9d9d8"
 
+acorn@^6.0.1:
+  version "6.3.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.3.0.tgz#0087509119ffa4fc0a0041d1e93a417e68cb856e"
+
+acorn@^7.1.0:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-7.1.0.tgz#949d36f2c292535da602283586c2477c57eb2d6c"
+
 ajv@^5.3.0:
   version "5.5.2"
   resolved "https://registry.yarnpkg.com/ajv/-/ajv-5.5.2.tgz#73b5eeca3fab653e3d3f9422b341ad42205dc965"
@@ -130,9 +139,9 @@ assertion-error@^1.0.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.1.0.tgz#e60b6b0e8f301bd97e5375215bda406c85118c0b"
 
-async-limiter@~1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.0.tgz#78faed8c3d074ab81f22b4e985d79e8738f720f8"
+async-limiter@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.1.tgz#dd379e94f0db8310b08291f9d64c3209766617fd"
 
 async@1.x:
   version "1.5.2"
@@ -1005,15 +1014,19 @@ crypto-browserify@^3.0.0:
     randombytes "^2.0.0"
     randomfill "^1.0.3"
 
-cssom@0.3.x, "cssom@>= 0.3.2 < 0.4.0":
-  version "0.3.4"
-  resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.3.4.tgz#8cd52e8a3acfd68d3aed38ee0a640177d2f9d797"
+cssom@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.4.1.tgz#b24111d236b6dbd00cdfacb5ab67a20473381fe3"
 
-cssstyle@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/cssstyle/-/cssstyle-1.0.0.tgz#79b16d51ec5591faec60e688891f15d2a5705129"
+cssom@~0.3.6:
+  version "0.3.8"
+  resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.3.8.tgz#9f1276f5b2b463f2114d3f2c75250af8c1a36f4a"
+
+cssstyle@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/cssstyle/-/cssstyle-2.0.0.tgz#911f0fe25532db4f5d44afc83f89cc4b82c97fe3"
   dependencies:
-    cssom "0.3.x"
+    cssom "~0.3.6"
 
 dashdash@^1.12.0:
   version "1.14.1"
@@ -1021,13 +1034,13 @@ dashdash@^1.12.0:
   dependencies:
     assert-plus "^1.0.0"
 
-data-urls@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/data-urls/-/data-urls-1.0.0.tgz#24802de4e81c298ea8a9388bb0d8e461c774684f"
+data-urls@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/data-urls/-/data-urls-1.1.0.tgz#15ee0582baa5e22bb59c77140da8f9c76963bbfe"
   dependencies:
-    abab "^1.0.4"
-    whatwg-mimetype "^2.0.0"
-    whatwg-url "^6.4.0"
+    abab "^2.0.0"
+    whatwg-mimetype "^2.2.0"
+    whatwg-url "^7.0.0"
 
 date-now@^0.1.4:
   version "0.1.4"
@@ -1167,9 +1180,9 @@ escodegen@1.8.x:
   optionalDependencies:
     source-map "~0.2.0"
 
-escodegen@^1.9.1:
-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/escodegen/-/escodegen-1.11.0.tgz#b27a9389481d5bfd5bec76f7bb1eb3f8f4556589"
+escodegen@^1.11.1:
+  version "1.12.0"
+  resolved "https://registry.yarnpkg.com/escodegen/-/escodegen-1.12.0.tgz#f763daf840af172bb3a2b6dd7219c0e17f7ff541"
   dependencies:
     esprima "^3.1.3"
     estraverse "^4.2.0"
@@ -1449,9 +1462,11 @@ https-browserify@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/https-browserify/-/https-browserify-1.0.0.tgz#ec06c10e0a34c0f2faf199f7fd7fc78fffd03c73"
 
-iconv-lite@0.4.19:
-  version "0.4.19"
-  resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.19.tgz#f7468f60135f5e5dad3399c0a81be9a1603a082b"
+iconv-lite@0.4.24:
+  version "0.4.24"
+  resolved "https://registry.yarnpkg.com/iconv-lite/-/iconv-lite-0.4.24.tgz#2022b4b25fbddc21d2f524974a474aafe733908b"
+  dependencies:
+    safer-buffer ">= 2.1.2 < 3"
 
 ieee754@^1.1.4:
   version "1.1.12"
@@ -1499,6 +1514,10 @@ invariant@^2.2.2:
   dependencies:
     loose-envify "^1.0.0"
 
+ip-regex@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/ip-regex/-/ip-regex-2.1.0.tgz#fa78bf5d2e6913c911ce9f819ee5146bb6d844e9"
+
 is-buffer@^1.1.0:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/is-buffer/-/is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
@@ -1599,35 +1618,35 @@ jsbn@~0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/jsbn/-/jsbn-0.1.1.tgz#a5e654c2e5a2deb5f201d96cefbca80c0ef2f513"
 
-jsdom@^11.6.2:
-  version "11.12.0"
-  resolved "https://registry.yarnpkg.com/jsdom/-/jsdom-11.12.0.tgz#1a80d40ddd378a1de59656e9e6dc5a3ba8657bc8"
+jsdom@^15.2.1:
+  version "15.2.1"
+  resolved "https://registry.yarnpkg.com/jsdom/-/jsdom-15.2.1.tgz#d2feb1aef7183f86be521b8c6833ff5296d07ec5"
   dependencies:
     abab "^2.0.0"
-    acorn "^5.5.3"
-    acorn-globals "^4.1.0"
+    acorn "^7.1.0"
+    acorn-globals "^4.3.2"
     array-equal "^1.0.0"
-    cssom ">= 0.3.2 < 0.4.0"
-    cssstyle "^1.0.0"
-    data-urls "^1.0.0"
+    cssom "^0.4.1"
+    cssstyle "^2.0.0"
+    data-urls "^1.1.0"
     domexception "^1.0.1"
-    escodegen "^1.9.1"
+    escodegen "^1.11.1"
     html-encoding-sniffer "^1.0.2"
-    left-pad "^1.3.0"
-    nwsapi "^2.0.7"
-    parse5 "4.0.0"
+    nwsapi "^2.2.0"
+    parse5 "5.1.0"
     pn "^1.1.0"
-    request "^2.87.0"
-    request-promise-native "^1.0.5"
-    sax "^1.2.4"
+    request "^2.88.0"
+    request-promise-native "^1.0.7"
+    saxes "^3.1.9"
     symbol-tree "^3.2.2"
-    tough-cookie "^2.3.4"
+    tough-cookie "^3.0.1"
     w3c-hr-time "^1.0.1"
+    w3c-xmlserializer "^1.1.2"
     webidl-conversions "^4.0.2"
-    whatwg-encoding "^1.0.3"
-    whatwg-mimetype "^2.1.0"
-    whatwg-url "^6.4.1"
-    ws "^5.2.0"
+    whatwg-encoding "^1.0.5"
+    whatwg-mimetype "^2.3.0"
+    whatwg-url "^7.0.0"
+    ws "^7.0.0"
     xml-name-validator "^3.0.0"
 
 jsesc@^1.3.0:
@@ -1693,10 +1712,6 @@ lcov-parse@0.0.10:
   version "0.0.10"
   resolved "https://registry.yarnpkg.com/lcov-parse/-/lcov-parse-0.0.10.tgz#1b0b8ff9ac9c7889250582b70b71315d9da6d9a3"
 
-left-pad@^1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/left-pad/-/left-pad-1.3.0.tgz#5b8a3a7765dfe001261dde915589e782f8c94d1e"
-
 levn@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/levn/-/levn-0.3.0.tgz#3b09924edf9f083c0490fdd4c0bc4421e04764ee"
@@ -1712,7 +1727,7 @@ lodash.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
 
-lodash@^4.13.1, lodash@^4.17.4:
+lodash@^4.17.15, lodash@^4.17.4:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
 
@@ -1868,9 +1883,9 @@ number-is-nan@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
 
-nwsapi@^2.0.7:
-  version "2.0.8"
-  resolved "https://registry.yarnpkg.com/nwsapi/-/nwsapi-2.0.8.tgz#e3603579b7e162b3dbedae4fb24e46f771d8fa24"
+nwsapi@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/nwsapi/-/nwsapi-2.2.0.tgz#204879a9e3d068ff2a55139c2c772780681a38b7"
 
 oauth-sign@~0.8.1:
   version "0.8.2"
@@ -1940,9 +1955,9 @@ parse-asn1@^5.0.0:
     evp_bytestokey "^1.0.0"
     pbkdf2 "^3.0.3"
 
-parse5@4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/parse5/-/parse5-4.0.0.tgz#6d78656e3da8d78b4ec0b906f7c08ef1dfe3f608"
+parse5@5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/parse5/-/parse5-5.1.0.tgz#c59341c9723f414c452975564c7c00a68d58acd2"
 
 path-browserify@~0.0.0:
   version "0.0.1"
@@ -2008,6 +2023,10 @@ psl@^1.1.24:
   version "1.1.29"
   resolved "https://registry.yarnpkg.com/psl/-/psl-1.1.29.tgz#60f580d360170bb722a797cc704411e6da850c67"
 
+psl@^1.1.28:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/psl/-/psl-1.4.0.tgz#5dd26156cdb69fa1fdb8ab1991667d3f80ced7c2"
+
 public-encrypt@^4.0.0:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/public-encrypt/-/public-encrypt-4.0.2.tgz#46eb9107206bf73489f8b85b69d91334c6610994"
@@ -2026,7 +2045,7 @@ punycode@^1.3.2, punycode@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
 
-punycode@^2.1.0:
+punycode@^2.1.0, punycode@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
 
@@ -2117,19 +2136,19 @@ repeating@^2.0.0:
   dependencies:
     is-finite "^1.0.0"
 
-request-promise-core@1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/request-promise-core/-/request-promise-core-1.1.1.tgz#3eee00b2c5aa83239cfb04c5700da36f81cd08b6"
+request-promise-core@1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/request-promise-core/-/request-promise-core-1.1.3.tgz#e9a3c081b51380dfea677336061fea879a829ee9"
   dependencies:
-    lodash "^4.13.1"
+    lodash "^4.17.15"
 
-request-promise-native@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/request-promise-native/-/request-promise-native-1.0.5.tgz#5281770f68e0c9719e5163fd3fab482215f4fda5"
+request-promise-native@^1.0.7:
+  version "1.0.8"
+  resolved "https://registry.yarnpkg.com/request-promise-native/-/request-promise-native-1.0.8.tgz#a455b960b826e44e2bf8999af64dff2bfe58cb36"
   dependencies:
-    request-promise-core "1.1.1"
-    stealthy-require "^1.1.0"
-    tough-cookie ">=2.3.3"
+    request-promise-core "1.1.3"
+    stealthy-require "^1.1.1"
+    tough-cookie "^2.3.3"
 
 request@2.79.0:
   version "2.79.0"
@@ -2156,7 +2175,7 @@ request@2.79.0:
     tunnel-agent "~0.4.1"
     uuid "^3.0.0"
 
-request@^2.87.0:
+request@^2.88.0:
   version "2.88.0"
   resolved "https://registry.yarnpkg.com/request/-/request-2.88.0.tgz#9c2fca4f7d35b592efe57c7f0a55e81052124fef"
   dependencies:
@@ -2202,7 +2221,7 @@ safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.1, safe-buffer@^5.1.2,
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"
 
-safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
+"safer-buffer@>= 2.1.2 < 3", safer-buffer@^2.0.2, safer-buffer@^2.1.0, safer-buffer@~2.1.0:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
 
@@ -2214,9 +2233,11 @@ samsam@~1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/samsam/-/samsam-1.1.3.tgz#9f5087419b4d091f232571e7fa52e90b0f552621"
 
-sax@^1.2.4:
-  version "1.2.4"
-  resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
+saxes@^3.1.9:
+  version "3.1.11"
+  resolved "https://registry.yarnpkg.com/saxes/-/saxes-3.1.11.tgz#d59d1fd332ec92ad98a2e0b2ee644702384b1c5b"
+  dependencies:
+    xmlchars "^2.1.1"
 
 semver@^5.3.0:
   version "5.5.0"
@@ -2311,7 +2332,7 @@ sshpk@^1.7.0:
     jsbn "~0.1.0"
     tweetnacl "~0.14.0"
 
-stealthy-require@^1.1.0:
+stealthy-require@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/stealthy-require/-/stealthy-require-1.1.1.tgz#35b09875b4ff49f26a777e509b3090a3226bf24b"
 
@@ -2427,12 +2448,20 @@ to-iso-string@0.0.2:
   version "0.0.2"
   resolved "https://registry.yarnpkg.com/to-iso-string/-/to-iso-string-0.0.2.tgz#4dc19e664dfccbe25bd8db508b00c6da158255d1"
 
-tough-cookie@>=2.3.3, tough-cookie@^2.3.4, tough-cookie@~2.4.3:
-  version "2.4.3"
-  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.4.3.tgz#53f36da3f47783b0925afa06ff9f3b165280f781"
+tough-cookie@^2.3.3:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.5.0.tgz#cd9fb2a0aa1d5a12b473bd9fb96fa3dcff65ade2"
   dependencies:
-    psl "^1.1.24"
-    punycode "^1.4.1"
+    psl "^1.1.28"
+    punycode "^2.1.1"
+
+tough-cookie@^3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-3.0.1.tgz#9df4f57e739c26930a018184887f4adb7dca73b2"
+  dependencies:
+    ip-regex "^2.1.0"
+    psl "^1.1.28"
+    punycode "^2.1.1"
 
 tough-cookie@~2.3.0:
   version "2.3.4"
@@ -2440,6 +2469,13 @@ tough-cookie@~2.3.0:
   dependencies:
     punycode "^1.4.1"
 
+tough-cookie@~2.4.3:
+  version "2.4.3"
+  resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-2.4.3.tgz#53f36da3f47783b0925afa06ff9f3b165280f781"
+  dependencies:
+    psl "^1.1.24"
+    punycode "^1.4.1"
+
 tr46@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/tr46/-/tr46-1.0.1.tgz#a8b13fd6bfd2489519674ccde55ba3693b706d09"
@@ -2595,23 +2631,31 @@ w3c-hr-time@^1.0.1:
   dependencies:
     browser-process-hrtime "^0.1.2"
 
+w3c-xmlserializer@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/w3c-xmlserializer/-/w3c-xmlserializer-1.1.2.tgz#30485ca7d70a6fd052420a3d12fd90e6339ce794"
+  dependencies:
+    domexception "^1.0.1"
+    webidl-conversions "^4.0.2"
+    xml-name-validator "^3.0.0"
+
 webidl-conversions@^4.0.2:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/webidl-conversions/-/webidl-conversions-4.0.2.tgz#a855980b1f0b6b359ba1d5d9fb39ae941faa63ad"
 
-whatwg-encoding@^1.0.1, whatwg-encoding@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/whatwg-encoding/-/whatwg-encoding-1.0.3.tgz#57c235bc8657e914d24e1a397d3c82daee0a6ba3"
+whatwg-encoding@^1.0.1, whatwg-encoding@^1.0.5:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz#5abacf777c32166a51d085d6b4f3e7d27113ddb0"
   dependencies:
-    iconv-lite "0.4.19"
+    iconv-lite "0.4.24"
 
-whatwg-mimetype@^2.0.0, whatwg-mimetype@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/whatwg-mimetype/-/whatwg-mimetype-2.1.0.tgz#f0f21d76cbba72362eb609dbed2a30cd17fcc7d4"
+whatwg-mimetype@^2.2.0, whatwg-mimetype@^2.3.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz#3d4b1e0312d2079879f826aff18dbeeca5960fbf"
 
-whatwg-url@^6.4.0, whatwg-url@^6.4.1:
-  version "6.5.0"
-  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-6.5.0.tgz#f2df02bff176fd65070df74ad5ccbb5a199965a8"
+whatwg-url@^7.0.0:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/whatwg-url/-/whatwg-url-7.1.0.tgz#c2c492f1eca612988efd3d2266be1b9fc6170d06"
   dependencies:
     lodash.sortby "^4.7.0"
     tr46 "^1.0.1"
@@ -2635,16 +2679,20 @@ wrappy@1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
 
-ws@^5.2.0:
-  version "5.2.2"
-  resolved "https://registry.yarnpkg.com/ws/-/ws-5.2.2.tgz#dffef14866b8e8dc9133582514d1befaf96e980f"
+ws@^7.0.0:
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/ws/-/ws-7.2.0.tgz#422eda8c02a4b5dba7744ba66eebbd84bcef0ec7"
   dependencies:
-    async-limiter "~1.0.0"
+    async-limiter "^1.0.0"
 
 xml-name-validator@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/xml-name-validator/-/xml-name-validator-3.0.0.tgz#6ae73e06de4d8c6e47f9fb181f78d648ad457c6a"
 
+xmlchars@^2.1.1:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/xmlchars/-/xmlchars-2.2.0.tgz#060fe1bcb7f9c76fe2a17db86a9bc3ab894210cb"
+
 xtend@^4.0.0, xtend@^4.0.1, xtend@~4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.1.tgz#a5c6d532be656e23db820efb943a1f04998d63af"