updateGithubStatus(opts={}) {
    const statusObj = Object.assign({context: 'Lighthouse'}, opts);

    return this.github.repos.createStatus(statusObj).then(status => {
      console.log(status.data.description);
      return status;
    });
  }
Updates associated PR status.
@param {!Object=} opts Options to set the status with.
@return {!Promise<Object>} Status object from Github API.