Travis CI: Fix Travis linter errors (#1802)

* Travis CI: Fix Travis linter errors

* fixup! Format Python code with psf/black push

* Update .travis.yml

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Christian Clauss committed 6y ago

ab3400bfad35f91756ef88e1b53f8865afc09a75

Parent: 1bc84e1

Committed by GitHub <[email protected]> on 3/14/2020, 10:55:13 PM