title: Proguard rule for Huawei push client
body: <p>I have <code>Unable to create application im.app.android.core.AppDemoApplication: e3.b: com.pushserver.android.huaweiPushClient cant cast com.myApp.android.push_lib.huawei.HcmPushClient to  PushClient</code> error</p>
  <p>What proguard rule should I add? I have tried <code>-keep class com.myApp.android.push_lib.** { *; }</code> but after that I just see the blank screen - no crash, just stuck when trying to start.</p>