Monkey patch to replace read_toml_opts entirely. Resolves #4

[csala]

Resolves #4

This PR exploits the fact that plugin modules are imported along with the rest of the mdformat code to monkey patch the mdformat._conf.read_toml_opts and replace it with an equivalent one that loads the options from the pyproject.toml file instead of the .mdformat.toml one.

This change allows setting in the pyproject.toml file all the options that can be set in the .mdformat.toml one, including the internal mdformat options lile exclude, and not just the ones that affect the markdown_it object like was happening before.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.50%. Comparing base (9f1d852) to head (0e96e78).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   92.00%   92.50%   +0.50%     
==========================================
  Files           2        2              
  Lines          50       40      -10     
==========================================
- Hits           46       37       -9     
+ Misses          4        3       -1     

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