Update README.md

README.md

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 ## Get the source code 
 
-- The project is being developed in a [Gitlab repository](https://cst.version.fz-juelich.de/jupedsim/jpsvis). 
+- The project is being developed in a [Gitlab repository](https://gitlab.version.fz-juelich.de/jupedsim/jpsvis). 
 - Our [GitHub repository](https://github.com/JuPedSim/jpsvis) is used to host selected tags and releases.
 
 So, get the code from Gitlab and the releases from GitHub. :-)
@@ -16,7 +20,7 @@ To highlight some features of JuPedSim we have uploaded some videos on our [YouT
 We are heavily working on this project which means that:
 
 - It’s not done. We will be releasing new enhancements, bug fixes etc.
-- We love your support. If you find any errors or have suggestions, please write an issue in our [issue-tracker](https://cst.version.fz-juelich.de/jupedsim/jpsvis/issues). We will try hard to fix it.
+- We love your support. If you find any errors or have suggestions, please write an issue in our [issue-tracker](https://gitlab.version.fz-juelich.de/jupedsim/jpsvis/issues). We will try hard to fix it.
 - Be patient. We are scientists and PhD/master students. Therefore, we primarily care about our research and theses. 
 
 ## Requirements