chores: Update changelog to mention changes in the signup API

Author: KShivendu

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## unreleased
 
+## [0.11.10] - 2022-12-12
+
+- Respond with field error on existing email id in signup api
+
 ## [0.11.9] - 2022-12-06
 
 -   Fixes issue where if send_email is overridden with a different email, it will reset that email.