Update Changelog

CHANGELOG.md

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 # Changelog
 
+## [0.7.2] -- unreleased
+
+### Features
+
+- Respect exif rotation of images
+- perf: Only clean out old messages from the database every 500 syncs. (There is usually more than one sync every second)
+
+### Bugfixes
+
+- Fix not being able to join rooms
+
 ## [0.7.1] -- 2020-04-24
 
 ### Features