Add to .travis.yml to auto-deploy to pypi

[khanhak]

Goal: auto-deploy to PyPI When something is pushed to master:

• automatically run tests with pytests
• if tests pass, deploy to pypi (ensuring to create a new version number)

[codecov[bot]]

Codecov Report

Merging #56 (f4f97df) into fix/installfailpython37 (aaea368) will not change coverage. The diff coverage is n/a.

@@                   Coverage Diff                    @@
##           fix/installfailpython37      #56   +/-   ##
========================================================
  Coverage                    81.21%   81.21%           
========================================================
  Files                           13       13           
  Lines                          607      607           
========================================================
  Hits                           493      493           
  Misses                         114      114           

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