enum34 only where it's needed

[funkyHat]

In some configurations installing enum34 into a newer Python can break stdlib packages as it may mask the stdlib enum module

[codecov]

Codecov Report

Merging #34 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   91.14%   91.14%           
=======================================
  Files          45       45           
  Lines        2609     2609           
  Branches      270      270           
=======================================
  Hits         2378     2378           
  Misses        142      142           
  Partials       89       89

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[Revolution1]

Thank you for contributing!

The mark works well with pip install -r but seems not works with setup.py -> parse_requirements() https://github.com/Revolution1/etcd3-py/blob/master/setup.py#L31

Could you remove enum34 it from requirements.txt and add it to https://github.com/Revolution1/etcd3-py/blob/master/setup.py#L82 ?