🔧 MAINTAIN: Update development packages

[chrisjsewell]

The name of the package is already set up to use markdown-it-py in numerous places, but setup_cfg_fmt is hard-coded to convert these dashes to underscores https://github.com/asottile/setup-cfg-fmt/blob/de922db829605a067c7a407eb42620c3cb4466a0/setup_cfg_fmt.py#L365 🤷

[codecov]

Codecov Report

Merging #154 (3b2b1ad) into master (13c5129) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #154   +/-   ##
=======================================
  Coverage   96.10%   96.10%           
=======================================
  Files          60       60           
  Lines        3232     3232           
=======================================
  Hits         3106     3106           
  Misses        126      126           

Flag	Coverage Δ
pytests	96.10% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 13c5129...3b2b1ad. Read the comment docs.

[hukkin]

The underscored name will be normalized as per https://www.python.org/dev/peps/pep-0503/#normalized-names so it shouldn't be an issue. setup-cfg-fmt itself can be used to demonstrate: it defines underscored name in setup.cfg but the name shows hyphened on PyPI page and the package is installable with pip install setup-cfg-fmt. The package also refers to itself using the hyphened name in the README etc.

Here's the reasoning why setup-cfg-fmt chooses to use underscores.

So personally I'd prefer keep the formatter (but won't be upset if you remove it 😄).

[chrisjsewell]

There's other things like the Conda build though, and yeh I can't be bothered to deal with potential side effects for the sake of a formatter.
If you could just turn this one change off, then I'd certainly want to keep it

[hukkin]

In fact we could change the name to markdown--_---......it-_py lol. You can try pip install markdown--_---......it-_py, works perfectly 😄