code: function tagRelease(done) {
    const version = require(config.pkg).version;
    git.tag(`v${version}`, `release: tag version ${version}`, done);
  }
docs: Tag current version: the tag name will be extracted from
  the `version` field in the `package.json` file.
  
  @param {function} done The `done` callback.
  @return {void}