title: Adding a header to all swagger requests
body: <p>I am currently adding swagger to an old project and I would like to add a header to all requests. 
  The application has a filter that checks if your app version is high enough and thus requires the clients to send in a <code>version</code> header.</p>
  
  <p>Is it possible to add this to all requests or do I have to rewrite all endpoints to have this header parameter(there is a lot of them). Would be really nice to have a global header parameter.</p>
  
  <p>Should be added that I would like to do this in Java and not change the json/yaml directly</p>