.travis.yml: Update to latest sphinx and python versions

sphinx-contrib / images

sphinxcontrib-images extension

Apache License 2.0

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Closed t-b closed 4 years ago

t-b commented 4 years ago

@jonascj I would say the current coverage of sphinx versions should be enough. But I added 2.2 and 2.1 nevertheless.

jonascj commented 4 years ago

I'll get to this tomorrow. Maybe we should so something about Sphinx 3?

t-b commented 4 years ago

@jonascj Done.

jonascj commented 4 years ago

Great work, cheers!