Fixed memory leak during history record.

[sophietheis]

No description provided.

[codecov]

Codecov Report

Merging #206 into master will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #206      +/-   ##
==========================================
+ Coverage   80.44%   80.52%   +0.07%     
==========================================
  Files          84       84              
  Lines        5339     5339              
==========================================
+ Hits         4295     4299       +4     
+ Misses       1044     1040       -4     

Impacted Files	Coverage Δ
tyssue/core/history.py	90.90% <100.00%> (ø)
tyssue/draw/plt_draw.py	65.88% <0.00%> (+0.33%)	⬆️
tyssue/behaviors/sheet/delamination_events.py	70.00% <0.00%> (+7.50%)	⬆️

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