chore(package): update eslint to version 4.7.0

Closes #2

Author: greenkeeper[bot]

package.json

@@ -49,7 +49,7 @@
   "devDependencies": {
     "codecov": "^2.0.0",
     "docdash": "web-build-hub/docdash",
-    "eslint": "^3.16.1",
+    "eslint": "^4.7.0",
     "mocha": "^3.2.0",
     "nyc": "^10.0.0",
     "proxyquire": "1.8.0",