code: function performRelease() {
    return gulp.src([config.pkg, config.dist])
        .pipe(git.add({args: '-f'}))
        .pipe(git.commit('release: release version'));
  }
docs: Commit the current changes:
  - The `dist` directory containing final bundle.
  - The `package.json` containing the new version number.
  
  @return {WritableStream} The stream pipeline.