chore(package): update eslint to version 4.3.0

Closes #19

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "postcss": "^5.2.5"
   },
   "devDependencies": {
-    "eslint": "^3.8.1",
+    "eslint": "^4.3.0",
     "eslint-config-standard": "^7.0.0",
     "eslint-plugin-promise": "^3.3.0",
     "eslint-plugin-standard": "^2.0.1",