Sendgrify

Released 2023-05-27

- Fix build issues.

Released 2023-05-27

- Force named parameters for `send()`.
- Add [justfile](./justfile) to automate operations.
- Add [README](./README.md) to [setup.py](./setup.py).
- Deprecate `html` parameter in favor of `as_markdown`.

Released 2021-03-01

- Relocate tests.
- Add license and tests documentation.

Release 2021-03-01

- Fix description and useful tags for PyPi.

- Add initial code.
- Add documentation.
- Add tests.
- Add makefile.