Tatsu

- 竜 **TatSu** is now only tested against Python 3.8. Earlier versions of Python are now deprecated, and Python 2.X versions are no longer supported ([apalala](https://github.com/apalala)).
- Apply `nameguard` only if `token[0].isalpha()`. This solves a regression afecting previous TatSu and Grako grammars ([apalala](https://github.com/apalala)).
- Remove `pygraphviz` from develoment requirements, as it doesn't build under Py38 ([apalala](https://github.com/apalala))
- [\56](https://github.com/neogeny/TatSu/issues/56) Include missing `tatsu/g2e/antlr.ebnf` in distribution ([apalala](https://github.com/apalala))
- [\138](https://github.com/neogeny/TatSu/issues/138) Reimplement the calculation of `FIRST`, `FOLLOW`, and `LOOKAHEAD` sets using latest theories. For now, this should improve parser error reporting, but should eventually enable the simplification of parsing of leftrec grammars ([apalala](https://github.com/apalala)).
- [\153](https://github.com/neogeny/TatSu/issues/153) Import ABCs from `collections.abc` ([tirkarthi](https://github.com/tirkarthi))
- Remove support for ``Cython``and ``pypy3`` ([apalala](https://github.com/apalala)).

- The default regexp for whitespace was changed to \`<span class="title-ref">(?s)s+</span>
- Allow empty patterns (`//`) like Python does
- [\65](https://github.com/neogeny/TatSu/issues/65) Allow initial, consecutive, and trailing `namechars`
- [\73](https://github.com/neogeny/TatSu/issues/73) Allow `whitespace :: None` and `whitespace :: False`
- [\75](https://github.com/neogeny/TatSu/issues/75) Complete implemenation of left recursion([Victorious3](https://github.com/Victorious3))
- [\77](https://github.com/neogeny/TatSu/issues/77) Allow `keyword` throughout the grammar
- [\89](https://github.com/neogeny/TatSu/issues/89) Make all attributes defined in the rule present in the resulting `AST` or `Node` even if the associated expression was not parsed
- [\93](https://github.com/neogeny/TatSu/issues/93) Fix trace colorization on Windows
- [\96](https://github.com/neogeny/TatSu/issues/96) Documented each `directive`
- Switched the documentation to the "Alabaster" theme
- Various code and documentation fixes ([davesque](https://github.com/davesque), [nicholasbishop](https://github.com/nicholasbishop), [rayjolt](https://github.com/rayjolt))

* 66 Fix multiline ( (?x) ) patterns not properly supported in grammar (pdw-mb)
* 70 Important upgrade to ModelBuilder and grammar specification of classes for generated nodes. See pull request 78 for details (Victorious3)

* 56 Add missing tatsu/g2e/antlr.ebnf to distribution (Ruth-Polymnia)
* 62 Fix TatSu ignoring start rule provided in command line (r-chaves)
* Fix typos in documentation (mjdominus

* 42 Rename vim files from `grako.vim` to `tatsu.vim` (fcoelho)
* 51 Fix inconsistent code generation for `whitespace` (fpom)
* 54 Only care about case of first letter of rule name for determining advance over whitespace (acw1251)

* 40 Make the start rule default to the first rule defined in the grammar (hariedo)
* 43 Import `re` from `tatsu.util` to support optional `regex`-only features (azazel75)
* 47 Fix incorrect sample code in documentation