Update README.md

Florian Lautenschlager · Florian Lautenschlager · commit 72952197c8aa · 2015-12-16T10:45:53.000+01:00
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 [![Build Status](https://travis-ci.org/ChronixDB/chronix.examples.svg?branch=master)](https://travis-ci.org/ChronixDB/chronix.examples)
+[![Apache License 2](http://img.shields.io/badge/license-ASF2-blue.svg)](https://github.com/ChronixDB/chronix.examples/blob/master/LICENSE)
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 # The Chronix Examples Repository
 The repository contains some example showcases of Chronix.
 
