Remove old_names argument

[veni-vidi-vici-dormivi]

• Closes remove old_names argument #396
• Fully documented, including CHANGELOG.rst

[veni-vidi-vici-dormivi]

Note to self: we don't need any depreciation wrangling here because the old_names argument is only used internally, never exposed to the user.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.97%. Comparing base (9b0b76b) to head (d8dff52).
Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   87.90%   87.97%   +0.07%     
==========================================
  Files          40       40              
  Lines        1745     1747       +2     
==========================================
+ Hits         1534     1537       +3     
+ Misses        211      210       -1     

Flag	Coverage Δ
unittests	87.97% <100.00%> (+0.07%)	⬆️

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[veni-vidi-vici-dormivi]

Do we want a CHANGELOG entry for things like this @mathause, given it is an exclusively internal change. Or maybe is it common to have a CHANGELOG entry saying internal adjustments to dependency changes in PRs a b and c... ?

[mathause]

Do we want a CHANGELOG entry for things like this @mathause, given it is an exclusively internal change. Or maybe is it common to have a CHANGELOG entry saying internal adjustments to dependency changes in PRs a b and c... ?

We don't need a changelog entry for every PR & I decide on a case by case basis; for strictly internal changes I often don't add one. Here I'd add statsmodels to the list of "supported versions".

Can you add the statsmodels pin to setup.cfg?

[mathause]

b.t.w. its deprecation (only one i)

[mathause]

Feel free to add the PR number above the list

[mathause]

Thanks