removed port 3006 and restore to default 3000 (#101)

* removed port 3006 and restore to default 3000

* updated port in README

Author: pietrop

README.md

@@ -42,7 +42,7 @@ Fork this repository + git clone + cd into folder
 npm start
 ```
 
-Visit [http://localhost:3006](http://localhost:3006)
+Visit [http://localhost:3000](http://localhost:3000)
 
 
 ## Usage - production

package.json

@@ -16,7 +16,7 @@
     "dist"
   ],
   "scripts": {
-    "start": "PORT=3006 react-scripts start",
+    "start": "react-scripts start",
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject",
     "build:example": "react-scripts build",