Fix security issue with dependency

Author: Joost de Valk

package.json

@@ -42,7 +42,7 @@
     "grunt": "^1.0.1",
     "grunt-eslint": "^20.1.0",
     "load-grunt-config": "^0.19.2",
-    "nightwatch": "^0.9.15",
+    "nightwatch": "^1.1.11",
     "ps-tree": "^1.1.0",
     "time-grunt": "^1.4.0",
     "watchify": "^3.9.0"