code: function inc(importance) {
      // get all the files to bump version in
      return gulp.src(['./package.json'])
          // bump the version number in those files
          .pipe(bump({type: importance}))
          // save it back to filesystem
          .pipe(gulp.dest('./'))
          // commit the changed version number
          .pipe(git.commit('Bumps package version'))
          // read only one file to get the version number
          .pipe(filter('package.json'))
          // **tag it in the repository**
          .pipe(tagVersion({
              prefix: ''
          }));
  }
docs: Bumping version number and tagging the repository with it.
  Please read http://semver.org/
  
  You can use the commands
  
  gulp patch     # makes v0.1.0 -> v0.1.1
  gulp feature   # makes v0.1.1 -> v0.2.0
  gulp 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.