Update CHANGES and clean code

CHANGES.md

@@ -5,13 +5,14 @@ Features ✨:
  -
 
 Improvements 🙌:
- -
+ - The initial sync is now handled by a foreground service
 
 Other changes:
  -
 
 Bugfix 🐛:
- -
+ - Fix avatar image disappearing (#777)
+ - Fix read marker banner when permalink
 
 Translations 🗣:
  -

vector/src/main/java/im/vector/riotx/features/home/room/list/RoomListFragment.kt

@@ -28,7 +28,6 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import com.airbnb.epoxy.OnModelBuildFinishedListener
 import com.airbnb.mvrx.*
-import com.google.android.material.snackbar.Snackbar
 import im.vector.matrix.android.api.failure.Failure
 import im.vector.matrix.android.api.session.room.model.Membership
 import im.vector.matrix.android.api.session.room.model.RoomSummary