[manylinux2014] CPython 3.5.9 → 3.5.10 & 3.9.0rc1 → 3.9.0rc2 (#768)
[manylinux2014] CPython 3.5.9 → 3.5.10 & 3.9.0rc1 → 3.9.0rc2 (#768)

Changelogs:

* https://docs.python.org/release/3.5.10/whatsnew/changelog.html
* https://docs.python.org/release/3.9.0rc2/whatsnew/changelog.html
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