Get the payload for the given PR number. Let exceptions bubble up.

def get_pr(pr_num, config=None, repo=DEFAULT_REPO, raw=False):
    """
    Get the payload for the given PR number. Let exceptions bubble up.
    """
    response = requests.get(PR_ENDPOINT.format(repo, pr_num), auth=get_auth_info(config))

    if raw:
        return response
    else:
        response.raise_for_status()
        return response.json()