title: How to create a Gitlab webhook to update a mirror repo on Github?
body: <p>I would like to create a webhook within Gitlab to automatically update a mirror repository on Github, whenever a <code>push</code> event happens. I've checked this <a href="http://demo.gitlab.com/help/web_hooks" rel="noreferrer">page</a>, but I didn't understand how it is done.</p>
  
  <p>My Gitlab version is 6.5. Here is the configuration page:</p>
  
  <p><img src="https://i.stack.imgur.com/nhXvz.png" alt="inserir a descrição da imagem aqui"></p>
  
  <p>What should I put in URL? Where do I need to place the script to update the repository?</p>