chore(package): update eslint to version 4.4.0

Closes #3

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "ava": "^0.19.1",
     "bluebird": "^3.5.0",
     "coveralls": "^2.13.1",
-    "eslint": "^3.19.0",
+    "eslint": "^4.4.0",
     "eslint-config-airbnb-base": "^11.1.3",
     "eslint-plugin-import": "^2.2.0",
     "nyc": "^10.3.0"