chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -33,9 +33,9 @@
   },
   "devDependencies": {
     "@types/mocha": "^2.2.42",
-    "@types/node": "^7.0.43",
+    "@types/node": "^8.0.54",
     "eslint": "^4.6.1",
-    "mocha": "^3.5.0",
+    "mocha": "^4.0.1",
     "prettier": "^1.9.0",
     "typescript": "^2.6.1",
     "vscode": "^1.1.6"