GitLab

Tighten up security. NEO/py does something similar:

https://lab.nexedi.com/nexedi/neoppod/blob/v1.12-61-gc1c26894/neo/lib/app.py#L76-78

On CPython 2.7.18:

    In [7]: list((k for k in dir(ssl) if k.startswith("PROTOCOL_TLSv")))
    Out[7]: ['PROTOCOL_TLSv1', 'PROTOCOL_TLSv1_1', 'PROTOCOL_TLSv1_2']