chore(package): update eslint to version 4.12.0

Closes #20

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
   },
   "devDependencies": {
     "mocha": "3.5.3",
-    "eslint": "4.7.0",
+    "eslint": "4.12.0",
     "request": "2.81.0"
   }
 }