code: function () {
        if (options['offline']) {
          options.drupalDistroRelease = '0.0.0';
        }
        else {
          // Find the latest stable release for the Drupal distro version.
          var done = this.async();
          options.drupalDistro.releaseVersion(options.drupalDistroVersion, done, function(err, version, done) {
            if (err) {
              this.env.error('Could not retrieve distribution project info: ' + err);
              return done(err);
            }
            options.drupalDistroRelease = version;
            done();
          }.bind(this));
        }
      }
docs: Determine the latest stable release for the requested Drupal core version.