Add changelog for 3.16.1

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

CHANGELOG.md

@@ -1,3 +1,14 @@
+## 3.16.1 (June, 01, 2021)
+
+Fix media tab not showing images/videos
+Connectivity checks fixed
+Crashing while retrieving avatar
+
+Minimum: NC 16 Server, Android 5.0 Lollipop 
+
+
+For a full list, please see https://github.com/nextcloud/android/milestone/58
+
 ## 3.16.0 (May, 05, 2021)
 
 Enhance sharing