Update changelog

Author: brianc

CHANGELOG.md

@@ -4,6 +4,10 @@ For richer information consult the commit log on github with referenced pull req
 
 We do not include break-fix version release in this file.
 
+### 7.3.0
+
+- Add support for [statement timeout](https://github.com/brianc/node-postgres/pull/1436).
+
 ### 7.2.0
 
 - Pinned pg-pool and pg-types to a tighter semver range. This is likely not a noticable change for you unless you were specifically installing older versions of those libraries for some reason, but making it a minor bump here just in case it could cause any confusion.