code: function inc(importance) {
      var git = require('gulp-git'),
          bump = require('gulp-bump'),
          filter = require('gulp-filter'),
          tag_version = require('gulp-tag-version');
  
      // get all the files to bump version in
      return gulp.src(['./package.json', './bower.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(tag_version());
  }
docs: Versioning tasks 
  Increments a version value within the package json and bower json