Sync from archive, add missing changelog entries.

debian/changelog

@@ -1,3 +1,15 @@
+libqtxdg (3.5.0-0ubuntu3) hirsute; urgency=medium
+
+  * No-change rebuild against qtbase-abi-5-15-2.
+
+ -- Dmitry Shachnev <mitya57@ubuntu.com>  Fri, 27 Nov 2020 14:09:29 +0300
+
+libqtxdg (3.5.0-0ubuntu2) hirsute; urgency=medium
+
+  * No-change rebuild against qtbase-abi-5-15-1.
+
+ -- Dmitry Shachnev <mitya57@ubuntu.com>  Fri, 30 Oct 2020 15:40:52 +0300
+
 libqtxdg (3.5.0-0ubuntu1) groovy; urgency=medium
 
   * New upstream release.