Update README

README.md

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 # FEderated User Credential Deployment PortAL (FEUDAL)
 - User interface: [Webpage](https://git.scc.kit.edu/feudal/feudalWebpage)
 - Component at the sites: [Client](https://git.scc.kit.edu/feudal/feudalClient)
 
 ## Installation
-- Needs Python 3.5 or 3.6
+- Needs Python 3.6
 - For debian 9: see debian/README.md
 - A puppet setup is could be made available.