Major Release

See commit for full details, includes:

• Introduce Footnotes extension
• Improve storage and use of source lines
• Improve recording of token position within source text
• Add logging of warnings for duplicate link/footnote definitions and unclosed front matter.
• Allow parsing of global context to renderers
• Disallow mixed backticks/tildes in code fence match (fixes miyuchina/mistletoe#91)

Note this breaks from the mistletoe fork

Introduce Position class

v0.10.0a4

bump version

Various improvements

v0.10.0a3

bump nyst_parser version

API Improvements

v0.10.0a2

bump version

Add Footnote Tokens

v0.10.0a1

bump version (alpha)

Add span token position attribute placeholder

Add position to span tokens

This is a placeholder for actually implementing span level position recording in a later commit

API Improvements

v0.9.4

bump version

Split span token read/init logic

Updated from:
ExecutableBookProject/mistletoe@a173ec3
and
ExecutableBookProject/mistletoe@f9a8189

Improve Documentation

Improve documentation (#4)

- Add renderers API and section reference targets
- Add GitHub issue templates

Fix Distribution

v0.9.2

Fix distribution