change ci badge to master

Author: rmllr

README.md

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 # jqa-kieker-plugin
 
 [![GitHub license](https://img.shields.io/badge/License-GPL%20v3-blue.svg)](https://github.com/softvis-research/jqa-kieker-plugin/blob/master/LICENSE)
-[![Build Status](https://travis-ci.com/softvis-research/jqa-kieker-plugin.svg?branch=development)](https://travis-ci.com/softvis-research/jqa-kieker-plugin)
+[![Build Status](https://travis-ci.com/softvis-research/jqa-kieker-plugin.svg?branch=master)](https://travis-ci.com/softvis-research/jqa-kieker-plugin)
 
 This is a stack trace parser of jQAssistant. It enables jQAssistant to scan and to analyze [Kieker](https://github.com/kieker-monitoring/kieker) trace event logs.