[core-workflow] Travis is now required to be passing, reviews are not

[Brett Cannon]

I didn't turn on Codecov requirements for the patch because we seem to
still have variance in them where some module that are inconsistently being
tested (there is a test for the whole project but I left that off as well).
I think we should definitely work towards fixing the coverage variance as I
would like to require no drop in code coverage at some point, but as of
right now it's wonky enough to be too much of a showstopper to flip on. I
have opened https://github.com/python/core-workflow/issues/38 to track this
and any modules whose coverage is inconsistent so we can eventually fix
this and require coverage doesn't decrease.
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