Fix microsecond precision loss in datetime hydration (kodemore#3)

[stortiz-lifeworks]

Fixes #3

[codecov-commenter]

Codecov Report

Merging #4 (7256625) into main (31fb2a3) will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #4      +/-   ##
==========================================
+ Coverage   95.79%   95.88%   +0.08%     
==========================================
  Files          26       26              
  Lines        1308     1311       +3     
==========================================
+ Hits         1253     1257       +4     
+ Misses         55       54       -1     

Impacted Files	Coverage Δ
tests/test_iso_datetime.py	100.00% <ø> (ø)
chili/iso_datetime.py	90.58% <100.00%> (+1.56%)	⬆️

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