Fix travis build with python3.6

Some dependencies (cryptography / cffi) starts requiring a rust compiler. However, using a more recent `pip` should download the correct wheel, prebuilt.
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Glandos 2021-04-06 14:03:40 +02:00 committed by GitHub
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@ -7,4 +7,5 @@ python:
- "3.9"
script: tox
install:
- pip install --upgrade pip
- pip install tox-travis