add build badge

Pietro Grandi · Pietro Grandi · commit 6e7933e655d7 · 2016-06-22T15:59:46.000+02:00
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+[![Build Status](https://travis-ci.org/pietro909/one-source-of-truth-for-angular.svg?branch=youtube)](https://travis-ci.org/pietro909/one-source-of-truth-for-angular)
 # One Source of Truth for Angular 2
 
 Brief description of the article and what it covers.

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