Release/0.3.1

[peterrrock2]

This is the main release PR for 0.3.1. Main changes are that Kruskal's now uses a minimum spanning tree rather than a maximum, and region-aware has been improved so that it deterministically selects a region-splitting edge when multiple possible balance edges are found. These were already more likely to appear due to the surcharges, but now we specifically select them when possible.

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 91.90%. Comparing base (229ff29) to head (9dba10a).

❗ Current head 9dba10a differs from pull request most recent head 0184159. Consider uploading reports for the commit 0184159 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
+ Coverage   91.88%   91.90%   +0.01%     
==========================================
  Files          38       38              
  Lines        1911     1940      +29     
==========================================
+ Hits         1756     1783      +27     
- Misses        155      157       +2     

Files	Coverage Δ
gerrychain/proposals/tree_proposals.py	73.75% <100.00%> (+0.25%)	⬆️
gerrychain/tree.py	95.35% <96.05%> (-0.53%)	⬇️

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[cdonnay]

Done!

[cdonnay]

Done!