note DELETE on container

Author: kjetilk

CHANGELOG.md

@@ -7,6 +7,8 @@
     - `acl:defaultForNew` is deprecated in favour of `ack:default`.
 - Terms of Service may be added and enforced for new registrations,
   but is disabled by default.    	
+- DELETE operations on a resource now require that the user has write permissions on
+  the file's container
 
 
 #### 5.0.0 Upgrade Notes