Added comments to TOML output. Fixes #20.

[apollo13]

The output is not perfect, let me know if you have style improvements that you want to see.

Also neither of the current dumpers supports comments in nested models.

[codecov-commenter]

Codecov Report

Merging #22 (bce6692) into main (188d1fb) will decrease coverage by 0.23%.
The diff coverage is 93.75%.

❗ Current head bce6692 differs from pull request most recent head c06659e. Consider uploading reports for the commit c06659e to get more accurate results

@@             Coverage Diff             @@
##              main      #22      +/-   ##
===========================================
- Coverage   100.00%   99.76%   -0.24%     
===========================================
  Files            9        9              
  Lines          418      431      +13     
  Branches        48       50       +2     
===========================================
+ Hits           418      430      +12     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
goodconf/__init__.py	99.23% <90.00%> (-0.77%)	⬇️
tests/test_goodconf.py	100.00% <100.00%> (ø)

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[ipmb]

Any thoughts on why the test coverage dropped?

[apollo13]

Could you merge #21, then I will retry after rebasing.

[apollo13]

I had missing branch coverage :) (did not test a missing docstring)