perform tests on windows, macos using github actions

[chfw]

…/github.com/pyexcel/pyexcel/pull/234

With your PR, here is a check list:

• Has test cases written?
• Has all code lines tested?
• Has make format been run?
• Please update CHANGELOG.yml(not CHANGELOG.rst)
• Passes all Travis CI builds
• Has fair amount of documentation if your change is complex
• Agree on NEW BSD License for your contribution

[codecov-io]

Codecov Report

Merging #47 (30b4efc) into dev (c616ab9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev      #47   +/-   ##
=======================================
  Coverage   97.89%   97.89%           
=======================================
  Files          13       13           
  Lines         617      617           
=======================================
  Hits          604      604           
  Misses         13       13           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c616ab9...54e3c5e. Read the comment docs.