Document changes and release 4

debian/changelog

+librem5-base (4) amber-phone; urgency=medium
+
+  [ Mohammed Sadiq ]
+  * pam: Allow simple numeric passwords.
+    Remove the obscure setting from /etc/pam.d/common-password allowing
+    for weaker passwords so we can use the pin as password.
+    As modifying /etc/pam.d/common-password isn't a viable solution,
+    a new profile named pam-librem5 with higher priority is added
+    to /usr/share/pam-configs/.
+    Closes: https://source.puri.sm/Librem5/gnome-control-center/issues/17
+
+  [ Guido Günther ]
+  * Work around old systemd on PureOS amber.
+    The version does not yet support the render group.
+    See https://tracker.pureos.net/T839
+  * Split out debug packages.
+    Unfortunately we're not allowed to depend on dbgsym packages in pureos.
+
+ -- Guido Günther <agx@sigxcpu.org>  Tue, 08 Oct 2019 11:08:59 +0200
+
 librem5-base (3) amber-phone; urgency=medium
 
   [ Guido Günther ]