code: function bumpVersion(importance) {
    return gulp.src(['./package.json', './bower.json'])
        .pipe(bump({type: importance}))
        .pipe(gulp.dest('./'))
        .pipe(git.commit('bump package version'))
        .pipe(filter('package.json'))
        .pipe(tagVersion());
  }
docs: Bumping version number and tagging the repository with it.
  Please read http://semver.org/
  
  You can use the commands
  
  gulp bump-patch     # makes v0.1.0 → v0.1.1
  gulp bump-feature   # makes v0.1.1 → v0.2.0
  gulp bump-release   # makes v0.2.1 → v1.0.0
  
  To bump the version numbers accordingly after you did a patch,
  introduced a feature or made a backwards-incompatible release.