Fix travis build with python3.6 (#734)

Upgrade pip **and** virtualenv, as mentioned in https://travis-ci.community/t/pip-install-cryptography-fails-on-py36/11233/4

Tox is building its own virtualenv, so the image from TravisCI might not be enough for pip to find the wheel.
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Glandos 2021-04-06 22:49:49 +02:00 committed by GitHub
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@ -6,5 +6,7 @@ python:
- "3.8"
- "3.9"
script: tox
before_install:
- python -m pip install --upgrade pip virtualenv
install:
- pip install tox-travis