Add Server watch mode

nodemon.json

+{
+  "execMap": {
+    "js": "babel-node"
+  },
+  "watch": ["src/*", "public/*"],
+  "ext": "js, html, css, json"
+}

package.json

@@ -4,10 +4,11 @@
   "private": true,
   "scripts": {
     "start": "npm run prod",
-    "dev": "NODE_ENV=development babel-node ./src/bin/www",
+    "dev": "NODE_ENV=development npm run watch ./src/bin/www",
     "prod": "npm run build && NODE_ENV=production node ./dist/bin/www",
     "build": "npm run clean && babel ./src --out-dir dist",
-    "clean": "rimraf dist"
+    "clean": "rimraf dist",
+    "watch": "nodemon --config ./nodemon.json --"
   },
   "dependencies": {
     "cookie-parser": "~1.4.3",
@@ -22,6 +23,7 @@
     "@babel/node": "^7.2.2",
     "@babel/preset-env": "^7.3.1",
     "eslint": "^5.13.0",
-    "eslint-plugin-import": "^2.16.0"
+    "eslint-plugin-import": "^2.16.0",
+    "nodemon": "^1.18.9"
   }
 }