code: public Observable<Tag> updateTagAsync(UUID projectId, UUID tagId, Tag updatedTag) {
          return updateTagWithServiceResponseAsync(projectId, tagId, updatedTag).map(new Func1<ServiceResponse<Tag>, Tag>() {
              @Override
              public Tag call(ServiceResponse<Tag> response) {
                  return response.body();
              }
          });
      }
docs: Update a tag.
  
  @param projectId The project id
  @param tagId The id of the target tag
  @param updatedTag The updated tag model
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Tag object