Add support for MIN/MAX functions

[greshilov]

No description provided.

[codecov-commenter]

Codecov Report

Merging #8 (5c47970) into master (d280cf4) will decrease coverage by 0.84%.
The diff coverage is 91.11%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   88.34%   87.50%   -0.85%     
==========================================
  Files           5        5              
  Lines         103      128      +25     
==========================================
+ Hits           91      112      +21     
- Misses         12       16       +4     

Flag	Coverage Δ
unit	87.50% <91.11%> (-0.85%)	⬇️

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Impacted Files	Coverage Δ
pysegmenttree/test_utils.py	86.11% <75.00%> (-10.05%)	⬇️
pysegmenttree/__init__.py	100.00% <100.00%> (ø)
pysegmenttree/_abc.py	83.33% <100.00%> (+16.66%)	⬆️
pysegmenttree/_pysegmenttree_py.py	89.13% <100.00%> (+0.49%)	⬆️
pysegmenttree/_segmenttree.py	88.88% <100.00%> (ø)

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