[issue37324] collections: remove deprecated aliases to ABC classes

[Chih-Hsuan Yen]

Chih-Hsuan Yen <yan12125 at gmail.com> added the comment:

In CPython commit 5380def8269b24a8a3bc46396373a1dc91b1dd1a, bundled pip is updated to 19.2.1, and since pip 19.2 an html5lib patch is backported [1] to "prefer importing from collections.abc instead of collections" [2]. I believe https://github.com/python/cpython/pull/10596 can be revisited now.

[1] https://github.com/pypa/pip/commit/ef7ca1472c1fdd085cffb8183b7ce8abbe9e2800
[2] https://github.com/pypa/pip/commit/3d6bb3a29676f880e84014d98afcb5ac74a9844e

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nosy: +yan12125

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