[docs] [issue32996] Improve What's New in 3.7

[bbayles]

bbayles <bbayles at gmail.com> added the comment:

Two things I'm familiar with that should probably be mentioned in the Library updates:

* bpo-32102: New argument capture_output for subprocess.run
* bpo-21417: Added support for setting the compression level for zipfile.ZipFile.

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nosy: +bbayles

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<https://bugs.python.org/issue32996>
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