- Migrated patches for 8.14.
- Up wacoq to 8.14 in docker image
- install: 8.14 requires `coq-core` and `coq-stdlib` to be installed.
- Set version 0.14.0.

Nothing too remarkable, code-wise, but a big change upstream is the
addition of `zarith` as a hard dependency.

TODO:

- update addons

Thanks to enjoysmath, closes #206

I have done a quick pass and tried to tidy the readme up a bit.

Please don't hesitate to further refine.