chore(package): update eslint to version 3.19.0 (#88)

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -28,7 +28,7 @@
   },
   "license": "MIT",
   "devDependencies": {
-    "eslint": "3.18.0",
+    "eslint": "3.19.0",
     "expect.js": "0.3.1",
     "husky": "0.13.3",
     "lint-staged": "3.4.0",