Merge pull request #248 from documentcloud/dependabot/npm_and_yarn/grunt-1.5.2

Bump grunt from 1.3.0 to 1.5.2

Author: jgonggrijp

package.json

@@ -6,7 +6,7 @@
     "underscore": "1.10.2"
   },
   "devDependencies": {
-    "grunt": "^1.3.0",
+    "grunt": "^1.5.2",
     "grunt-cli": "^1.3.2",
     "grunt-contrib-concat": "1.0.1",
     "grunt-contrib-jshint": "^2.1.0",