title: How to change the port for the npm run watch?
body: <p>I am trying to watch the development using <code>npm run watch</code>. But it moved to <a href="http://localhost:3000" rel="nofollow noreferrer">http://localhost:3000</a> instead of <a href="http://localhost:8080" rel="nofollow noreferrer">http://localhost:8080</a>. How to change this port 3000 to 8080? 
  Because I am using the Tomcat server in 8080 port.</p>
  
  <pre><code>[BS] Proxying: http://localhost:8080
  [BS] Access URLs:
   -----------------------------------------------------------------------
         Local: http://localhost:3000/server1/demo3/index.html
      External: http://192.168.126.1:3000/server1/demo3/index.html
   -----------------------------------------------------------------------
            UI: http://localhost:3001
   UI External: http://192.168.126.1:3001
   -----------------------------------------------------------------------
  </code></pre>