title: Proguard no longer works with Retrofit
body: <p>I have found older questions which touch on the same subject but with the latest versions none of the available answers work for me.</p>
  
  <p>I am using Retrofit in my project. When I try to assemble I get the following error:</p>
  
  <p>Warning: retrofit.client.OkClient: can't find referenced class com.squareup.okhttp.OkHttpClient</p>
  
  <p>I'm using the following but none of it is helping:</p>
  
  <pre><code>-keepattributes Signature
  
  -keep class retrofit.** { *; }
  -keep class retrofit.http.** { *; }
  -keep class retrofit.client.** { *; }
  -keep class com.squareup.okhttp.** { *; }
  -keep interface com.squareup.okhttp.** { *; }
  -keep class com.google.gson.** { *; }
  -keep class com.google.inject.* { *; }
  -keep class org.apache.http.* { *; }
  -keep class org.codehaus.mojo.** { *; }
  -keep class org.apache.james.mime4j.* { *; }
  -keep class javax.inject.* { *; }
  -keep class sun.misc.Unsafe { *; }
  
  -libraryjars libs/acra-4.5.0.jar
  -libraryjars libs/radial-menu-v4.jar
  
  -dontwarn javax.xml.stream.events.**
  -dontwarn rx.**
  -dontwarn org.apache.lang.**
  
  # Application classes that will be serialized/deserialized over Gson
  -keep class com.example.package.network.** { *; }
  </code></pre>
  
  <p>Has anybody had this issue recently and resolved it?</p>