public void removeAt(int position){
  mUsers.remove(position);
  notifyItemRemoved(position);
  notifyItemRangeChanged(position,mUsers.size());
}

public void removeAt ( int position ) { mUsers . remove ( position ) ; notifyItemRemoved ( position ) ; notifyItemRangeChanged ( position , mUsers . size ( ) ) ; }
removes a user from the list
