[issue31355] Remove Travis CI job: rely on buildbots

[STINNER Victor]

STINNER Victor added the comment:


New changeset 501b324d3a940d26e0021a38aae8d896a30fbcff by Victor Stinner in branch 'master':
bpo-31355: Travis CI: remove the macOS job (#3367)
https://github.com/python/cpython/commit/501b324d3a940d26e0021a38aae8d896a30fbcff


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<http://bugs.python.org/issue31355>
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