update feature list

README.md

@@ -13,7 +13,7 @@ This is a URL shorter written in Python with Flask als Webhandler. The Webserver
 * account system based on google and github oauth (user can view and delete his links)
 * qr code generation after link is shorten
 * easy deployment
-* can run in offline enviorements (behind a firewall)
+* can run in offline enviorements (only without login)
 
 ## Why is this one better than other
 * no ADs