DEVOPS-247: apply npm install --save-dev for grunt packages

Author: Katsuya-Tomioka

package.json

@@ -47,10 +47,10 @@
     "argparse": "^1.0.6",
     "chai": "^3.5.0",
     "eslint": "^6.0.1",
-    "grunt": "^0.4.5",
+    "grunt": "^1.0.4",
     "grunt-contrib-clean": "^1.0.0",
-    "grunt-contrib-watch": "^0.6.1",
-    "grunt-gh-pages": "^1.0.0",
+    "grunt-contrib-watch": "^1.1.0",
+    "grunt-gh-pages": "^3.1.0",
     "grunt-jsdoc": "^1.1.0",
     "grunt-jslint": "^1.1.14",
     "grunt-mocha-test": "^0.12.7",