Add nodemon as dev script

nodemon.json

@@ -0,0 +1,3 @@
+{
+    "ext": "js,json,css,pug,md"
+}

package.json

@@ -19,11 +19,12 @@
     "string-replace-middleware": "^1.0.2"
   },
   "devDependencies": {
-    "license-check-and-add": "^3.0.4"
+    "license-check-and-add": "^3.0.4",
+    "nodemon": "^2.0.7"
   },
   "scripts": {
-    "start": "node index.js",
-    "dev": "NODE_ENV=development node index.js",
+    "start": "node ./",
+    "dev": "NODE_ENV=development ./node_modules/nodemon/bin/nodemon.js --config nodemon.json ./",
     "license:check": "./node_modules/license-check-and-add/dist/src/cli.js check",
     "license:add": "./node_modules/license-check-and-add/dist/src/cli.js add",
     "license:remove": "./node_modules/license-check-and-add/dist/src/cli.js remove",