chore(package): update eslint to version 6.0.1

Closes #59

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "coveralls": "^2.11.6",
-    "eslint": "^4.4.1",
+    "eslint": "^6.0.1",
     "eslint-config-airbnb-base": "^11.0.1",
     "eslint-plugin-import": "^2.2.0",
     "ghooks": "^2.0.0",