chore(package): update eslint to version 4.3.0

Closes #12

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "chai": "^3.5.0",
     "chai-as-promised": "^6.0.0",
     "customize": "^2.0.1",
-    "eslint": "^3.19.0",
+    "eslint": "^4.3.0",
     "eslint-config-standard": "^10.2.0",
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-node": "^4.2.2",