Add missing subscribeFor import

Author: adasiewiczr

samplekotlin/src/main/java/com/example/chattutorial/ChannelActivity4.kt

@@ -17,6 +17,7 @@ import com.getstream.sdk.chat.viewmodel.messages.MessageListViewModel.Mode.Threa
 import com.getstream.sdk.chat.viewmodel.messages.MessageListViewModel.State.NavigateUp
 import com.getstream.sdk.chat.viewmodel.messages.bindView
 import io.getstream.chat.android.client.ChatClient
+import io.getstream.chat.android.client.controllers.subscribeFor
 import io.getstream.chat.android.client.events.TypingStartEvent
 import io.getstream.chat.android.client.events.TypingStopEvent
 import io.getstream.chat.android.client.models.Channel
@@ -87,12 +88,11 @@ class ChannelActivity4 : AppCompatActivity() {
         ChatClient
             .instance()
             .channel(cid)
-            .subscribeFor(this, TypingStartEvent::class.java, TypingStopEvent::class.java
+            .subscribeFor(this, TypingStartEvent::class, TypingStopEvent::class
             ) { event ->
                 when (event) {
                     is TypingStartEvent -> currentlyTyping.add(event.user.name)
                     is TypingStopEvent -> currentlyTyping.remove(event.user.name)
-                    else -> Unit
                 }
 
                 binding.typingHeader.text = when {