use towncrier to handle change log entries

[zacharyburnett]

this may not be needed for this project, but it's good to keep romanisim using the same infrastructure as romancal

Tip

For a public change, remember to write news fragment(s) in changes/:

• changes/<PR#>.apichange.rst: change to public API
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.general.rst: infrastructure or miscellaneous change

Otherwise, add the label no-changelog-entry-needed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.24%. Comparing base (81028a8) to head (4f15158).
Report is 51 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #147   +/-   ##
=======================================
  Coverage   89.24%   89.24%           
=======================================
  Files          17       17           
  Lines        2073     2073           
=======================================
  Hits         1850     1850           
  Misses        223      223           

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