Add travis config

[vadymmarkov]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@3d24e21). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #110   +/-   ##
=========================================
  Coverage          ?   92.95%           
=========================================
  Files             ?       62           
  Lines             ?     3066           
  Branches          ?        0           
=========================================
  Hits              ?     2850           
  Misses            ?      216           
  Partials          ?        0

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