[python-committers] Travis now checks for whitespace issues in PRs

[Brett Cannon]

I just pushed a change to master, 3.6, and 3.5 where
Tools/scripts/patchcheck.py now has a --travis option which will run the
whitespace fixers from `make patchcheck` but trigger a Travis build failure
if any changes were necessary. This only runs on Linux so it is a PR
blocker, but also so it isn't done more than once per PR.

This was not backported to 2.7 because I honestly didn't want to do the
work to fix the merge conflicts.
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