chore(package): update eslint to version 4.9.0

Closes #10

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-preset-env": "^1.2.2",
     "babel-preset-es2015": "^6.24.0",
-    "eslint": "^3.19.0",
+    "eslint": "^4.9.0",
     "eslint-config-airbnb-base": "^11.1.3",
     "eslint-plugin-import": "^2.2.0",
     "json-loader": "^0.5.4",