Expand test matrix

[atodorov]

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[atodorov]

@carlio - I am not a member of this repository so in Travis CI you need to add a Cron job for master branch that executes every day even if there are no new commits. This is what I added for pylint_django.

I hate updating these test matrices by hand. In the past I wrote https://github.com/MrSenko/strazar to help me with that and had used it successfully for automation. It needs hosting and maintenance however. Maybe we can spend some time investigating pyup.io and contributing to them. I personally wanted to add a parser for dependencies defined in setup.py but that's another story.

[carlio]

@atodorov I'll figure this out; pylint-plugin-utils really is now only used by pylint-django (as far as I know) so perhaps we could just fold it in there, though I like leaving it in case anyone wants to make pylint-twisted or something.

For the parsing setup.py - check out requirements-detector - a library I wrote to do exactly that parsing of a setup.py or requirements.txt to get the version requirements.