Fix cryptography build in travis cicd by upgrading distribution from Trusty Tahr to Focal Fossa (#585)

* Update .travis.yml

* Also change 3.9-dev to 3.9 because that is now supported by travis
pull/588/head
Pieter Marsman 2021-02-20 10:32:07 +01:00 committed by GitHub
parent f389b97923
commit 761410e66c
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@ -1,9 +1,10 @@
dist: focal
language: python
python:
- "3.6"
- "3.7"
- "3.8"
- "3.9-dev"
- "3.9"
install:
- pip install tox==3.14.0 tox-travis flake8
script: