Also upgrade virtualenv

As mentioned in https://travis-ci.community/t/pip-install-cryptography-fails-on-py36/11233/4
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Glandos 2021-04-06 22:37:59 +02:00 committed by GitHub
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@ -7,7 +7,6 @@ python:
- "3.9"
script: tox
before_install:
- python -m pip install --upgrade pip
- python -m pip install --upgrade pip virtualenv
install:
- pip --version
- pip install tox-travis