remark-preset-lint-markdown-style-guide compatibility

[calgray]

Handle tables and ruler style of remark-preset-lint-markdown-style-guide used by hallmark.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.73418% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.75%. Comparing base (a5b9cd8) to head (6d24ec9).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...dformat_hallmark/hallmark_definitions_extension.py	98.70%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   96.87%   98.75%   +1.87%     
==========================================
  Files           2        2              
  Lines          64       80      +16     
==========================================
+ Hits           62       79      +17     
+ Misses          2        1       -1     

Flag	Coverage Δ
unit	98.75% <98.73%> (+1.87%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.