README.md: Remove ancient svn2git hints and mention currently important branches

Author: t-b

README.md

@@ -41,10 +41,11 @@ object browsing, discovery, and security features.
 
 For more information please visit [www.tango-controls.org](http://www.tango-controls.org).
 
-# cppTango - tango-9-lts branch
-This repository is the result of svn2git migration of Tango source code previously hosted on tango-cs Sourceforge project. It is combined from api/cppapi, api/log4tango, api/cpp_test_suite anf api/cpp_test_ds
+# Important branches
 
-cppTango tango-9-lts branch is the branch dedicated to Tango 9 Long Term Support version.
+- tango-9-lts: Tango 9 Long Term Support (LTS) development
+- 9.3-backports: Tango 9.3 binary compatible LTS version development
+- master: Future Tango version without CORBA (not yet functional)
 
 # Documentation