Latest Markdown release causes issues

[viksuper555]

Versions of the dependency Markdown 3.4 and later cause exceptions in this package.
Check Release history

Stack trace:

TypeError: extendMarkdown() missing 1 required positional argument: 'md_globals'
non-HTTP exception: extendMarkdown() missing 1 required positional argument: 'md_globals'
Traceback (most recent call last):
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask_caching/__init__.py", line 860, in decorated_function
return f(*args, **kwargs)
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask_blogging/views.py", line 129, in index
blogging_engine.process_post(post, render=render)
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask_blogging/engine.py", line 154, in process_post
post_processor.process(post, render)
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask_blogging/processor.py", line 79, in process
cls.render_text(post)
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/flask_blogging/processor.py", line 58, in render_text
md = markdown.Markdown(extensions=cls.all_extensions())
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/markdown/core.py", line 96, in __init__
self.registerExtensions(extensions=kwargs.get('extensions', []),
File "/tmp/8da6a7b605213c4/antenv/lib/python3.8/site-packages/markdown/core.py", line 125, in registerExtensions
ext.extendMarkdown(self)