Update tests and docs

[Djailla]

As Python 3.4 is end of life since 2019-03-18 https://www.python.org/downloads/release/python-3410/

Remove compat :

• update setup.py
• update docs
• update tox / travis / appveyor
• update tests with real examples

[codecov-io]

Codecov Report

Merging #142 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #142   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files           5        5           
  Lines         213      213           
  Branches       48       48           
=======================================
  Hits          185      185           
  Misses         21       21           
  Partials        7        7

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[Djailla]

@ryanhiebert done