Yaclog

Added

- `yaclog` tool for manipulating changelogs from the command line
- `init` command to make a new changelog
- `format` command to reformat the changelog
- `show` command to show changes from the changelog
- `entry` command for manipulating entries in the changelog
- `tag` command for manipulating tags in the changelog
- `release` command for creating releases

Added

- New yak log logo drawn by my sister

Changed

- Updated package metadata
- Rewrote parser to use a 2-step method that is more flexible.
- Parser can now handle code blocks.
- Parser can now handle setext-style headers and H2s not conforming to the schema.

First release

Added

- `yaclog.read()` method to parse changelog files