build: Update eslint to 0.4.0

Change-Id: I1931699c578de724996649838b73d514e1e03477

package.json

@@ -4,7 +4,7 @@
     "test": "grunt test"
   },
   "devDependencies": {
-    "eslint-config-wikimedia": "0.3.0",
+    "eslint-config-wikimedia": "0.4.0",
     "grunt": "1.0.1",
     "grunt-banana-checker": "0.5.0",
     "grunt-eslint": "19.0.0",