code: public void removeParticipants(@NonNull final String conversationId, @NonNull final List<String> ids, @Nullable Callback<ComapiResult<Void>> callback) {
          adapter.adapt(removeParticipants(conversationId, ids), callback);
      }
docs: Returns observable to remove list of participants from a conversation.
  
  @param conversationId ID of a conversation to delete.
  @param ids            List of participant ids to be removed.
  @param callback       Callback to deliver new session instance.