public function releaseNotes(
    $tag,
    $github_token,
    $options = [
      'prev-tag' => NULL,
    ]
  ) {
    $current_branch = $this->getCurrentBranch();
    $prev_tag = $this->getPrevTag($options, $current_branch);

    // @todo Check git version.
    $changes = $this->generateReleaseNotes($tag, $prev_tag, $github_token);
    $this->updateChangelog($tag, $changes);
  }