New ul_bullet_color parameter for FPDF.write_html()

[Lucas-C]

Feature requested in #1056

Checklist:

• The GitHub pipeline is OK (green), meaning that both pylint (static code analyzer) and black (code formatter) are happy with the changes of this PR.

• A unit test is covering the code added / modified by this PR

• This PR is ready to be merged

• In case of a new feature, docstrings have been added, with also some documentation in the docs/ folder

• A mention of the change is present in CHANGELOG.md

By submitting this pull request, I confirm that my contribution is made under the terms of the GNU LGPL 3.0 license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.42%. Comparing base (e85ec4e) to head (e98db5d).

❗ Current head e98db5d differs from pull request most recent head 32198c7. Consider uploading reports for the commit 32198c7 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1126   +/-   ##
=======================================
  Coverage   93.42%   93.42%           
=======================================
  Files          30       30           
  Lines        9130     9130           
  Branches     2071     2074    +3     
=======================================
  Hits         8530     8530           
  Misses        371      371           
  Partials      229      229           

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