Document changes and release 20

debian/changelog

+librem5-base (20) amber-phone; urgency=medium
+
+  [ Sebastian Krzyszkowiak ]
+  * profile.d: Set MOZ_ENABLE_WAYLAND.
+    This lets Firefox use Wayland natively.
+  * base-all: Add plymouth and its Librem 5 theme
+
+  [ Guido Günther ]
+  * ucm: Make headphones somewhat work.
+    Without that I only get static noise. Stereo is missing and
+    some amp levels are off.
+    This also fixes HP detection (so we switch automatically when inserted)
+    when the kernel bits are in.
+
+ -- Guido Günther <agx@sigxcpu.org>  Tue, 23 Jun 2020 17:41:51 +0200
+
 librem5-base (19) amber-phone; urgency=medium
 
   [ Guido Günther ]