remove deprecated HTMLParser.unescape

[methane]

BPO	37328
Nosy	@terryjreedy, @ezio-melotti, @methane, @ambv, @serhiy-storchaka
PRs	bpo-37328: remove deprecated HTMLParser.unescape #14186 bpo-27032, bpo-37328: Document removing HTMLParser.unescape(). #22288 [3.9] bpo-27032, bpo-37328: Document removing HTMLParser.unescape() (GH-22288) #22293

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-08-27.02:48:30.529>
created_at = <Date 2019-06-18.06:30:10.773>
labels = ['library', '3.9']
title = 'remove deprecated HTMLParser.unescape'
updated_at = <Date 2020-10-05.16:10:20.063>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2020-10-05.16:10:20.063>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-27.02:48:30.529>
closer = 'methane'
components = ['Library (Lib)']
creation = <Date 2019-06-18.06:30:10.773>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 37328
keywords = ['patch']
message_count = 5.0
messages = ['345954', '350587', '377047', '377080', '378054']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'ezio.melotti', 'methane', 'lukasz.langa', 'serhiy.storchaka']
pr_nums = ['14186', '22288', '22293']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue37328'
versions = ['Python 3.9']

[methane]

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.

[methane]

New changeset fae0ed5 by Inada Naoki in branch 'master':
bpo-37328: remove deprecated HTMLParser.unescape (GH-14186)
fae0ed5

[serhiy-storchaka]

New changeset a33f2c2 by Serhiy Storchaka in branch 'master':
bpo-27032, bpo-37328: Document removing HTMLParser.unescape(). (GH-22288)
a33f2c2

[terryjreedy]

New changeset 4daeb9e by Terry Jan Reedy in branch '3.9':
[3.9] bpo-27032, bpo-37328: Document removing HTMLParser.unescape() (GH-22288)
4daeb9e

[ambv]

New changeset 8dd4302 by Łukasz Langa (Terry Jan Reedy) in branch '3.9':
[3.9] bpo-27032, bpo-37328: Document removing HTMLParser.unescape() (GH-22288)
8dd4302