Improve AvailabilityRewrite and implement operation:override (#781)

Change-Id: Ibceecb26109796addc06bf15a47a48a01d566084
diff --git a/Changes b/Changes
index 545f29b..dd162f0 100644
--- a/Changes
+++ b/Changes
@@ -12,6 +12,7 @@
 - Fixed availability regex for all access in the config (important to correctly 
   determine required access of stored VC)
 - Rename CollectionRewrite to AvailabilityRewrite  
+- Improve AvailabilityRewrite and implement operation:override (#781) 
   
 
 # version 0.75