dev(hansbug): update __iter__ and __reversed__

[HansBug]

#44

[codecov]

Codecov Report

Merging #59 (fdeca27) into main (fcc3548) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #59   +/-   ##
=======================================
  Coverage   99.26%   99.26%           
=======================================
  Files          35       35           
  Lines        2165     2168    +3     
=======================================
+ Hits         2149     2152    +3     
  Misses         16       16           

Flag	Coverage Δ
unittests	99.26% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fcc3548...fdeca27. Read the comment docs.