Update pyopenssl to 20.0.1

[pyup-bot]

This PR updates pyOpenSSL from 19.1.0 to 20.0.1.

Changelog

20.0.1

-------------------

Backward-incompatible changes:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Deprecations:
^^^^^^^^^^^^^

Changes:
^^^^^^^^

- Fixed compatibility with OpenSSL 1.1.0.

20.0.0

-------------------


Backward-incompatible changes:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- The minimum ``cryptography`` version is now 3.2.
- Remove deprecated ``OpenSSL.tsafe`` module.
- Removed deprecated ``OpenSSL.SSL.Context.set_npn_advertise_callback``, ``OpenSSL.SSL.Context.set_npn_select_callback``, and ``OpenSSL.SSL.Connection.get_next_proto_negotiated``.
- Drop support for Python 3.4
- Drop support for OpenSSL 1.0.1 and 1.0.2

Deprecations:
^^^^^^^^^^^^^

- Deprecated ``OpenSSL.crypto.loads_pkcs7`` and ``OpenSSL.crypto.loads_pkcs12``.

Changes:
^^^^^^^^

- Added a new optional ``chain`` parameter to ``OpenSSL.crypto.X509StoreContext()``
where additional untrusted certificates can be specified to help chain building.
`948 <https://github.com/pyca/pyopenssl/pull/948>`_
- Added ``OpenSSL.crypto.X509Store.load_locations`` to set trusted
certificate file bundles and/or directories for verification.
`943 <https://github.com/pyca/pyopenssl/pull/943>`_
- Added ``Context.set_keylog_callback`` to log key material.
`910 <https://github.com/pyca/pyopenssl/pull/910>`_
- Added ``OpenSSL.SSL.Connection.get_verified_chain`` to retrieve the
verified certificate chain of the peer.
`894 <https://github.com/pyca/pyopenssl/pull/894>`_.
- Make verification callback optional in ``Context.set_verify``.
If omitted, OpenSSL's default verification is used.
`933 <https://github.com/pyca/pyopenssl/pull/933>`_
- Fixed a bug that could truncate or cause a zero-length key error due to a
null byte in private key passphrase in ``OpenSSL.crypto.load_privatekey``
and ``OpenSSL.crypto.dump_privatekey``.
`947 <https://github.com/pyca/pyopenssl/pull/947>`_

Links

• PyPI: https://pypi.org/project/pyopenssl
• Changelog: https://pyup.io/changelogs/pyopenssl/
• Homepage: https://pyopenssl.org/
• Docs: https://pythonhosted.org/pyOpenSSL/