code: public boolean removeItem(T item) {
          int index = mListItems.indexOf(item);
          if (index < 0) return false;
          mListItems.remove(index);
          notifyItemRemoved(index);
          return true;
      }
docs: Remove a single item and refresh the {@code RecyclerView} by calling
  {@code notifyItemRemoved()}.
  
  @param item item to add
  @return true if any data was modified by this operation, false otherwise.