Update README.md

Author: naraesk

README.md

@@ -40,16 +40,12 @@ Please have a look at our [Wiki](../../wiki/Home) which contains many additional
 
 ## Development Team
 
-### Main Contributors
-
 Getaviz is mainly developed by the research group [Visual Software Analytics](http://softvis.wifa.uni-leipzig.de) at Leipzig University. It has been developed over several years and is the basic for many scientific publications. Currently, four main developers are contributung actively to Getaviz:
 * [Richard Müller](https://github.com/rmllr)
 * Jan Schilbach
 * Pascal Kovacs
 * [David Baum](http://home.uni-leipzig.de/svis/Research%20Group/#DavidBaum)
 
-### Further Contributors
-
 Many thanks to all the contributors who have improved Getaviz by implementing new features or fixing bugs, especially:
 
 * Denise Zilch
@@ -59,6 +55,6 @@ Many thanks to all the contributors who have improved Getaviz by implementing ne
 * [Lisa Vogelsberg](https://github.com/Valekta/)
 * [Aaron Sillus](https://github.com/AaronSil)
 
-### Publications
+## Publications
 * Baum, David; Schilbach, Jan; Kovacs, Pascal; Eisenecker, Ulrich; Müller, Richard: [GETAVIZ: Generating Structural, Behavioral, and Evolutionary Views of Software Systems for Empirical Evaluation](https://www.researchgate.net/publication/320083290_GETAVIZ_Generating_Structural_Behavioral_and_Evolutionary_Views_of_Software_Systems_for_Empirical_Evaluation), IEEE VISSOFT, 2017
 * Baum, David; Dietrich, Jens; Anslow, Craig; Müller, Richard: [Visualizing Design Erosion: How Big Balls of Mud are Made](https://arxiv.org/abs/1807.06136), IEEE VISSOFT, 2018.