[issue31355] Remove Travis CI job: rely on buildbots

[STINNER Victor]

STINNER Victor added the comment:

Failures of the two Allowed Failure jobs, coverage and macOS, are not reported to GitHub PR. For example, the coverage job is failing on Python 3.6 since May 2016 at least, and nobody noticed.

I don't think that it's worth it to waste Travis CI resources if nobody notices failures.

See https://github.com/python/core-workflow/issues/101 for the discussion on Allowed Failures on Travis CI.

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