Add v1.6.1, v1.5.3 changelogs

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

CHANGELOG.md

@@ -16,6 +16,19 @@ All notable changes to this project will be documented in this file.
 * Unexpected borders on recipient pickers
 * Styling of automatic/manual account settings tabs
 
+## 1.6.1 – 2020-11-11
+### Fixed
+* Null error for messages with no sender information
+* Wrong php7.2 support claimed in info.xml of v1.6.0
+* Unexpected borders on recipient pickers
+* Styling of automatic/manual account settings tabs
+
+## 1.5.2 – 2020-11-11
+### Fixed
+* Null error for messages with no sender information
+* Unexpected borders on recipient pickers
+* Styling of automatic/manual account settings tabs
+
 ## 1.6.0 – 2020-11-04
 ### Added
 - Moving mails to other mailboxes of the same account (also usable on mobile)