Wwvb

What's Changed
* Manually patch iersdata based on information from Bulletin D by jepler in https://github.com/jepler/wwvbpy/pull/26


**Full Changelog**: https://github.com/jepler/wwvbpy/compare/2.0.1...2.0.2

For users:
* Add `wwvbdecode` commandline program
* fix `dut1table` program & add a test
* Add 'hexagram', a style that shows phase & amplitude in a single trace
* Add 'json' output style, looks a bit like `[{"year": 2021, "days": 350, "hour": 22, "minute": 48, "amplitude": "210001000200100001020011001012000000010200010001020001000002"}]`

For developers:
* Add coverage of CLI programs
* Analyze with _lgtm_, fixed a minor detected issue
* Test & fix minor problems on mac & windows
* Add more badges (lgtm & line counts)
* Allow the epoch to be settable, not always 1970-2069.
* Simplify get_am_bcd, an internal function
* Add a test of --style
* ensure pre-commit runs with a consistent python version (3.9) during CI; this can influence diagnostics from black!

**Full Changelog**: https://github.com/jepler/wwvbpy/compare/2.0.0...2.0.1

* Officially work with pypy 3.7 and 3.8; python 3.10
* add full type annotations (passes mypy --strict)
* use timezone info from dateutil
* add the ability to update dut1 data in a user or system location, separate from the wwvbpy distribution
* some "incompatible" changes to less important parts of the API

CI now runs on Python 3.7 through 3.10.

A pypy badge is now in the readme.

Further improvements to type checking & test coverage.

The project now type checks cleanly with `mypy --strict`.

Some changes to APIs that _should have been internal anyway_ (but were not and still are not marked as such) mean that in the semver sense this is a major version change.

A bug was fixed that prevented `updateiers --dist` (update the data to be distributed with wwvbpy) from running successfully.