[issue31355] Remove Travis CI macOS job: rely on buildbots

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I'm not aware of many (any?) instances yet where the Travis macOS instance has caught a problem.

It did help me on some delicate signals/threading issues.

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nosy: +pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31355>
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