title: Adding decodeSlash using Feign @RequestLine
body: <p>I am currently using a YAML file to generate the models and the API clients using the swagger plugin and I am using Feign OkHttpClient to make requests to the API, the problem here is the client encodes the URL but ignores the Slash(es) with this the API call fails. Is there a way to add <code>decodeSlash</code> parameter in the client? Or can this be achieved using an interceptor?</p>
  
  <p>Here is the sample path param where I am running into this issue. <code>QgKuK2DU/0%3D</code> where as it should be <code>QgKuK2DU%2F0%3D</code>  </p>