Update changelog for 3.38.1-1pureos0 release

debian/changelog

+gnome-contacts (3.38.1-1pureos0) byzantium; urgency=medium
+
+  * debian: add gitlab ci
+  * debian: backport upstream changes since 3.38 release
+  * debian: remove AUTHORS file from docs
+  * debian: bump vala to 0.48
+  * debian: add patches for long_press_gesture
+  * debian: add patches for add_call_chat_button
+  * debian: add patches for avatar-selector
+  * debian: update gbp.conf for byzantium
+
+ -- Julian Sparber <julian.sparber@puri.sm>  Fri, 18 Dec 2020 10:32:41 +0100
+
 gnome-contacts (3.38.1-1) unstable; urgency=medium
 
   * New upstream release