docs: public void addOrRemoveMembers(long gid, String[] addList, String[] removeList)
              throws APIConnectionException, APIRequestException {
          Members add = Members.newBuilder()
                  .addMember(addList)
                  .build();
  
          Members remove = Members.newBuilder()
                  .addMember(removeList)
                  .build();
  
          _groupClient.addOrRemoveMembers(gid, add, remove);
      }