[issue37328] remove deprecated HTMLParser.unescape

[Inada Naoki]

New submission from Inada Naoki <songofacandy at gmail.com>:

HTMLParser.unescape was removed once but resurrected because of distlib depended on it.  (see https://bugs.python.org/issue19688 )

Since it is deprecated from 3.4, it's safe to remove.

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components: Library (Lib)
messages: 345954
nosy: inada.naoki
priority: normal
severity: normal
status: open
title: remove deprecated HTMLParser.unescape
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37328>
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