setuptools 45.0 has not support py2

[vimiix]

Fix #33

[codecov-io]

Codecov Report

Merging #34 into master will decrease coverage by 0.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #34      +/-   ##
==========================================
- Coverage   94.96%   94.51%   -0.45%     
==========================================
  Files           7        7              
  Lines        2085     2024      -61     
  Branches      282      282              
==========================================
- Hits         1980     1913      -67     
- Misses         54       60       +6     
  Partials       51       51

Impacted Files	Coverage Δ
src/lazy_object_proxy/__init__.py	76.47% <0%> (-11.77%)	⬇️
tests/test_lazy_object_proxy.py	95.89% <0%> (-0.49%)	⬇️
src/lazy_object_proxy/slots.py	96.77% <0%> (-0.15%)	⬇️
src/lazy_object_proxy/simple.py	97.45% <0%> (-0.1%)	⬇️

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