code: function createReleaseTask(level) {
    /**
     * Prepare the release: upgrade version number according to
     * the specified level.
     *
   * @return {WritableStream} The stream pipeline.
     */
    function prepareRelease() {
      return bumpLevel(level);
    }
  
    return gulp.series(
        prepareRelease,
        performRelease,
        tagRelease,
        prepareNextRelease
    );
  }
docs: Create the release task.
  
  @param {string} level The version level upgrade.
  @return {function} The release task function.