dev(hansbug): add update method

[HansBug]

#44

[codecov]

Codecov Report

Merging #56 (e28a497) into main (bd4d17f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #56   +/-   ##
=======================================
  Coverage   99.25%   99.25%           
=======================================
  Files          35       35           
  Lines        2139     2155   +16     
=======================================
+ Hits         2123     2139   +16     
  Misses         16       16           

Flag	Coverage Δ
unittests	99.25% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
treevalue/tree/tree/tree.pyx	100.00% <100.00%> (ø)

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