html_parser causing "Deprecation Warning" in Python 3.8

[Gujal00]

This function has worked without any issues earlier, but is now raising a deprecation warning. Can this be fixed please.
This may be related to #307

Python 3.8.6 (tags/v3.8.6:db45529, Sep 23 2020, 15:52:53) [MSC v.1927 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from six.moves import html_parser
>>> s = ''quote' is <b>bold</b>'
>>> h = html_parser.HTMLParser()
>>> h.unescape(s)
<stdin>:1: DeprecationWarning: The unescape method is deprecated and will be removed in 3.5, use html.unescape() instead.
"'quote' is <b>bold</b>"
>>> 

It still works fine in Python 2.7

Python 2.7.16 (v2.7.16:413a49145e, Mar  4 2019, 01:37:19) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from six.moves import html_parser
>>> s = ''quote' is <b>bold</b>'
>>> h = html_parser.HTMLParser()
>>> h.unescape(s)
u"'quote' is <b>bold</b>"
>>> 

[pogman-code]

With Python 3.9 this goes beyond deprecation as it is not supported at all anymore:

The unescape() method in the html.parser.HTMLParser class has been removed (it was deprecated since Python 3.4). html.unescape() should be used for converting character references to the corresponding unicode characters.

cf. https://docs.python.org/3/whatsnew/3.9.html

Python 3.9.0 (default, Oct  7 2020, 23:09:01) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from six.moves import html_parser
>>> s = ''quote' is <b>bold</b>'
>>> h = html_parser.HTMLParser()
>>> h.unescape(s)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'HTMLParser' object has no attribute 'unescape'
>>> 

Edit: add example