update changelog

Changelog.md

@@ -2,6 +2,11 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.20] - 2023-07-25
+- Add WIP survey admin functionality
+- Add simple login and navigation from reports page to the survey
+- Fixed various bugs in the survey
+
 ## [0.19] - 2023-07-11
 - Added survey functionality under new `/survey` route with a separate frontend from the compendium reports frontend
 - Added authentication support for OIDC provider(s)