chore(package): update eslint to version 4.19.0

Closes #127

Author: greenkeeper[bot]

package.json

@@ -21,7 +21,7 @@
     "babel-cli": "^6.26.0",
     "babel-preset-es2015-node5": "^1.1.0",
     "codeclimate-test-reporter": "0.4.1",
-    "eslint": "4.14.0",
+    "eslint": "4.19.0",
     "express": "^4.14.0",
     "istanbul": "0.4.5",
     "mocha": "^4.0.0",