code: public Observable<ServiceResponse<Tag>> updateTagWithServiceResponseAsync(UUID projectId, UUID tagId, Tag updatedTag) {
          if (projectId == null) {
              throw new IllegalArgumentException("Parameter projectId is required and cannot be null.");
          }
          if (tagId == null) {
              throw new IllegalArgumentException("Parameter tagId is required and cannot be null.");
          }
          if (updatedTag == null) {
              throw new IllegalArgumentException("Parameter updatedTag is required and cannot be null.");
          }
          if (this.client.apiKey() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiKey() is required and cannot be null.");
          }
          Validator.validate(updatedTag);
          return service.updateTag(projectId, tagId, updatedTag, this.client.apiKey(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Tag>>>() {
                  @Override
                  public Observable<ServiceResponse<Tag>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<Tag> clientResponse = updateTagDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
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