upgrade grunt-eslint

Author: kazupon

package.json

@@ -32,7 +32,7 @@
     "casperjs": "^1.1.0-beta3",
     "codecov.io": "^0.1.2",
     "grunt": "^0.4.5",
-    "grunt-eslint": "^16.0.0",
+    "grunt-eslint": "^17.0.0",
     "grunt-karma": "^0.8.3",
     "jasmine-core": "^2.3.4",
     "karma": "^0.12.31",