add build status

Author: Skycoder42

README.md

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 # QtDataSync
 A simple offline-first synchronisation framework, to synchronize data of Qt applications between devices.
 
+[![Travis Build Status](https://travis-ci.org/Skycoder42/QtDataSync.svg?branch=master)](https://travis-ci.org/Skycoder42/QtDataSync)
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 ## Features
 - Document-Store like access, using QObjects and Q_GADGET classes
 	- Asynchronous access, general access to all data, with futures and onResult handler