updated readme

README.md

@@ -8,7 +8,7 @@ Please note, that this cannot replace real testing on an HMD, but allows simple
 ## Adding to your project
 Ideally you should add this plugin as a submodule to your project by executing 
 ```
-git submodule add -b 5.3 https://git-ce.rwth-aachen.de/vr-vis/VR-Group/unreal-development/tools/hmd-simulator.git Plugins/HMDSimulator
+git submodule add -b 5.5 https://git-ce.rwth-aachen.de/vr-vis/VR-Group/unreal-development/tools/hmd-simulator.git Plugins/HMDSimulator
 ```
 in the root of your project. 
 After starting the editor, you should check in `Edit->Plugins` if the plugin is enabled.