code: @NotNull
      @ObjectiveCName("makeAdminCommandWithGid:withUid:")
      public Command<Void> makeAdmin(final int gid, final int uid) {
          return callback -> modules.getGroupsModule().makeAdmin(gid, uid)
                  .then(v -> callback.onResult(v))
                  .failure(e -> callback.onError(e));
      }
docs: Make member admin of group
  
  @param gid group's id
  @param uid user's id
  @return Command for execution