chore(package): update eslint to version 4.1.0

Closes #285

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "babel-eslint": "^7.1.1",
     "coveralls": "^2.12.0",
-    "eslint": "^3.17.1",
+    "eslint": "^4.1.0",
     "eslint-config-springworks": "^7.0.7",
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-mocha": "^4.8.0",