code: function getVersionTags() {
  	var tags = exec('git tag', { silent: true }).output.trim().split(/\n/g);
  
  	return tags.reduce(function(list, tag) {
  		if (semver.valid(tag)) {
  			list.push(tag);
  		}
  		return list;
  	}, []).sort(semver.compare);
  }
docs: Gets the git tags that represent versions.
  @returns {string[]} An array of tags in the git repo.
  @private