Grunt is a Development dependency

package.json

@@ -6,7 +6,7 @@
   "directories": {
     "doc": "docs"
   },
-  "dependencies": {
+  "devDependencies": {
     "grunt-contrib-copy": "^0.8.0",
     "grunt-contrib-concat": "^0.5.1",
     "grunt-contrib-clean": "^0.6.0",
@@ -42,4 +42,4 @@
       "path": "./node_modules/cz-conventional-changelog"
     }
   }
-}
+}