[#154] adding integration with Travis+Codecov

[ferigis]

[close #154]

[elbrujohalcon]

@ferigis shouldn't we add some badge to the README.md, too?

[ferigis]

yes @elbrujohalcon, I am just testing if this works or not. If it works I will add the html in order to see the nice button in the readme
just testing :)

[michalwski]

This will not work yet. A codecov.json file needs to be created based on *.coverdata file. There is a rebar3 plugin for it:

{rebar3_codecov, {git, "https://github.com/zofpolkowska/rebar3_codecov.git", {ref, "3d0af19"}}}

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@ef342e5). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #157   +/-   ##
=========================================
  Coverage          ?   96.19%           
=========================================
  Files             ?        9           
  Lines             ?      394           
  Branches          ?        0           
=========================================
  Hits              ?      379           
  Misses            ?       15           
  Partials          ?        0

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[ferigis]

thanks @michalwski I think it is working now

[elbrujohalcon]

Merged and added to #155 as well.