Update eslint

Author: Amir-61

package.json

@@ -33,8 +33,8 @@
   "devDependencies": {
     "async-iterators": "^0.2.2",
     "bluebird": "^2.9.9",
-    "eslint": "^2.9.0",
-    "eslint-config-loopback": "^2.0.0",
+    "eslint": "^2.13.1",
+    "eslint-config-loopback": "^4.0.0",
     "mocha": "^2.1.0",
     "should": "^8.0.2"
   },