CHANGELOG.md in sk_api_schema-0.7.2 vs CHANGELOG.md in sk_api_schema-0.7.3

@@ -3,9 +3,11 @@
 See [commit messages](https://github.com/salesking/sk_api_schema/commits/) for details.
 Also signup to our [Developer Newsletter](http://www.salesking.eu/dev/newsletter/) to stay up-to-date !!!
 
 ##2013-04
 
+* filter attachments by related_object_type
+* new PubSub channel for attachments
 * new attachments/{ID}/download url DEPRECATE attachment.url
 * add lead_date to contact
 * make contact.lead_ref + lead_source text fields
 
 ##2013-03