Update developer docs to ensure compatibility with latest scikit-learn.

[ryanhausen]

Reference Issues/PRs

Fixes #314

What does this implement/fix? Explain your changes.

This addresses an issue that can happen if the neurodata/scikit-learn branch of scikit-learn is not compatable with the current stable release of scikit-learn, which can cause tests in treeple to fail.

Any other comments?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.00%. Comparing base (1d970b0) to head (3b10af5).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #319   +/-   ##
=======================================
  Coverage   80.00%   80.00%           
=======================================
  Files          24       24           
  Lines        2221     2221           
  Branches      411      411           
=======================================
  Hits         1777     1777           
  Misses        312      312           
  Partials      132      132           

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[adam2392]

Thanks @ryanhausen !