Update README.md

jarnovanleeuwen · web-flow · commit 7986364f3613 · 2018-06-20T09:56:18.000+02:00
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 # <img src="https://user-images.githubusercontent.com/1358997/33891467-4e1a15ea-df56-11e7-98a0-ecc3e1ec07f0.png" width="64">
 
+[![Build Status](https://travis-ci.com/jarnovanleeuwen/php-tikkie.svg?branch=master)](https://travis-ci.com/jarnovanleeuwen/php-tikkie)
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 #### Easily create payment requests through [Tikkie](https://tikkie.me/).
 
 Unofficial PHP implementation of the [Tikkie API](https://developer.abnamro.com/content/tikkie).
