Markdown2

- [pull 466] Add optional dependencies to `setup.py`

- [pull 439] Fix TypeError if html-classes extra is None
- [pull 441] Remove Python2 support
- [pull 445] Replace `<strike>` with `<s>` in strike extra
- [pull 446] Fix link patterns extra applying within links
- [pull 443] create proper entry point
- [pull 449] Codespans inside link text issue344
- [pull 451] Underline and HTML comments
- [pull 453] Links with brackets
- [pull 454] Fix emacs local variable one-liners
- [pull 457] Example of the current mixed-paragraph mode behavior in lists
- [pull 455] Fix code block indentation in lists
- [pull 434] Fix filter bypass leading to XSS (362)
- [pull 464] Fix html-classes extra not applying to code spans
- [pull 462] Fix pygments block matching
- [pull 462] Fix pyshell blocks in blockquotes
- [pull 463] Fix multilevel lists
- [pull 468] Remove `_uniform_outdent_limit` function
- [pull 470] Add support for ordered lists that don't start at 1. (469)
- [pull 472] Fix `AssertionError` with lazy numbered lists (issue 471)
- [pull 475] Add `<ul>` and `<ol>` tags to html-classes extra (352)
- [pull 473] XSS test and fix

- [pull 413] Fix meta indentation
- [pull 414] Fix code surrounded by blank lines inside blockquote fenced code blocks
- [pull 417] Fix inline code pipe symbol within tables (issue 399)
- [pull 418] Fix code block parsing error (issue 327)
- [pull 419] Fix hr block created when not supposed to (issue 400)
- [pull 421] Fix backslashes removed by adjacent code blocks (issues 369 and 412)
- [pull 420] Fix md5-* in resulting HTML when several code blocks follow one by one (issue 355)
- [pull 422] Fix excessive `<br>` tags in lists using break-on-newline extra (issue 394)
- [pull 424] Standardize key and value definitions for metadata extra (issue 423)
- [pull 427] Fix fenced code blocks breaking lists (issue 426)
- [pull 429] Fix catastrophic backtracking (Regex DoS) in pyshell blocks.
- [pull 431] Fix incorrect indentation of fenced code blocks within lists
- [pull 436] RST admonitions
- [pull 430] Improve error message if link_patterns forgotten
- [pull 437] fix compatibility with pygments 2.12

- [pull 408] Fix for fenced code blocks issue 396
- [pull 410] Be more strict on auto linking urls, RE DOS fix

- [pull 389] Tables extra: allow whitespace at the end of the underline row
- [pull 392] Pyshell extra: enable syntax highlighting if `fenced-code-blocks` is loaded.
- [pull 402] Regex DOS bandaid fix

- [pull 377] Fixed bug breaking strings elements in metadata lists
- [pull 380] When rendering fenced code blocks, also add the `language-LANG` class
- [pull 387] Regex DoS fixes