Update README.md

Author: Christian Schulz

README.md

@@ -1,5 +1,5 @@
 mt-KaHIP v1.00  [![Codacy Badge](https://api.codacy.com/project/badge/Grade/b4dc07be37694dc4841beba6ba038c19)](https://app.codacy.com/manual/schulzchristian/KaHIP?utm_source=github.com&utm_medium=referral&utm_content=schulzchristian/KaHIP&utm_campaign=Badge_Grade_Dashboard)
-[![Build Status](https://travis-ci.org/KaHIP/KaHIP.svg?branch=master)](https://travis-ci.org//KaHIP) 
+[![Build Status](https://travis-ci.org/KaHIP/mt-KaHIP.svg?branch=main)](https://travis-ci.org//KaHIP/mt-KaHIP) 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2FKaHIP%2Fmt-KaHIP.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2FKaHIP%2Fmt-KaHIP?ref=badge_shield)
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