chore(package): update eslint to version 5.0.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "ava": "^0.25.0",
     "coveralls": "^3.0.1",
-    "eslint": "^4.19.1",
+    "eslint": "^5.0.1",
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-import": "^2.11.0",
     "nyc": "^11.7.3"