References:
        https://developer.github.com/v3/issues/comments/#list-comments-on-an-issue

def list_pr_comments(repo: GithubRepository, pull_id: int
                     ) -> List[Dict[str, Any]]:
    """
    References:
        https://developer.github.com/v3/issues/comments/#list-comments-on-an-issue
    """
    url = ("https://api.github.com/repos/{}/{}/issues/{}/comments"
           "?access_token={}".format(repo.organization,
                                     repo.name,
                                     pull_id,
                                     repo.access_token))
    response = requests.get(url)
    if response.status_code != 200:
        raise RuntimeError(
            'Comments get failed. Code: {}. Content: {}.'.format(
                response.status_code, response.content))
    payload = json.JSONDecoder().decode(response.content.decode())
    return payload