added travis badge

Author: pmbittner

README.md

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 [![Language](https://img.shields.io/badge/Language-Haskell-purple)](https://www.haskell.org/)
 [![Documentation](https://img.shields.io/badge/Documentation-Read-purple)][documentation]
+[![Build Status](https://travis-ci.com/pmbittner/FeatureTraceRecording.svg?branch=esecfse21)](https://travis-ci.com/pmbittner/FeatureTraceRecording)
 [![License](https://img.shields.io/badge/License-GNU%20LGPLv3-blue)](LICENSE.LGPL3)
 [![Install](https://img.shields.io/badge/Install-Instructions-blue)](INSTALL.md)
 [![Status](https://img.shields.io/badge/ESEC%2FFSE'21-Badge%20Application-blue)](STATUS.md)
 
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 Artifact repository for the paper _Feature Trace Recording_, accepted at _ESEC/FSE 2021_.
 Authors are [Paul Maximilian Bittner][paul], [Alexander Schultheiß][alexander], [Thomas Thüm][thomas], [Timo Kehrer][timo], [Jeffrey M. Young][jeffrey], and [Lukas Linsbauer][lukas].