Merge pull request #33 from AtomLinter/renovate/xregexp-4.x

fix(deps): update dependency xregexp to v4

Author: Arcanemagus

package-lock.json

@@ -64,7 +64,7 @@
   "dependencies": {
     "atom-linter": "^10.0.0",
     "atom-package-deps": "^5.0.0",
-    "xregexp": "~3.2.0"
+    "xregexp": "~4.2.0"
   },
   "devDependencies": {
     "eslint": "4.19.1",