Update README.md

Author: naraesk

README.md

@@ -20,6 +20,8 @@ Getaviz is a toolset for designing, generating, and exploring software visualiza
 
 ## Development Team
 
+### Main Contributors
+
 Getaviz is developed by the research group [Softwarevisualization In 3D And Virtual Reality](https://home.uni-leipzig.de/svis/) of Leipzig University. It has been developed over several years and is the basic for many scientific publications. In 2018 we released Getaviz as open source to simplify collaboration and practical use of our research prototype. 
 
 Currently, four developers are contributung actively to Getaviz:
@@ -30,6 +32,13 @@ Currently, four developers are contributung actively to Getaviz:
 
 Have a look at our [website](https://home.uni-leipzig.de/svis/) for more information about our research group, visualization examples, and our publications. We are looking for collaborations with researchers and developers/companies. If you are interested, please contact us via email.
 
+### Further Contributors
+
+Many thanks to all the contributors who have improved Getaviz by implementing new featurer or fixing bugs, especially:
+
+* Denise Zilch
+* André Naumann
+
 ## How do I get set up? ###
 
 The recommended way is **not** to clone this repository, but to follow the instructions under [Oomph Setup](../../wiki/Oomph%20Setup).