chore(package): update eslint to version 3.19.0 (#39)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -33,7 +33,7 @@
   "homepage": "https://github.com/FullstackAcademy/eslint-config-fullstack#readme",
   "devDependencies": {
     "chai": "^3.5.0",
-    "eslint": "~3.18.0",
+    "eslint": "~3.19.0",
     "eslint-plugin-react": "~6.10.3",
     "mocha": "^3.0.0"
   },