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.
 
+### [email protected]
+
+- Add support for `idle_in_transaction_session_timeout` [option](https://github.com/brianc/node-postgres/pull/2049).
+
 ### 7.16.0
 - Add optional, opt-in behavior to test new, [faster query pipeline](https://github.com/brianc/node-postgres/pull/2044).  This is experimental, and not documented yet.  The pipeline changes will grow significantly after the 8.0 release.