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#874 (comment) notes pre-commit is needed on the CI.
This adds a new lint job to run pre-commit.
Also, instead of running local versions of the lint tools, which need installing explicitly on Travis, use pinned repo versions and let pre-commit install them.
This is the standard way of running pre-commit. @asottile wrote in #1073 (comment):
Finally, since pre-commit is also running Black, mypy and Flake8 in a single job, we no longer need them as separate jobs and can reduce the number from 6 to 4 (and Travis gives 5 parallel).