feat: add nodemon dependency for the development environment

Author: Victor

package.json

@@ -10,6 +10,7 @@
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",
-    "babel-preset-stage-0": "^6.24.1"
+    "babel-preset-stage-0": "^6.24.1",
+    "nodemon": "^2.0.15"
   }
 }