Update README.txt

docs not available anymore

Author: RogerKratz

README.txt

@@ -1,12 +1,9 @@
 The Envers project aims to enable easy auditing of persistent classes.
 
-Docs are available here
-http://envers.bitbucket.io
-
 Send user questions to NH user group list
 http://groups.google.com/group/nhusers
 
 Available as a nuget package
 http://nuget.org/packages/NHibernate.Envers
 
-Pull requests are welcome!
+Pull requests are welcome!