Update the changelog

debian/changelog

+gnutls28 (3.4.10-4ubuntu1.8co1) xenial; urgency=medium
+
+  * Merge changes from Ubuntu Xenial LTS. Remaining Apertis-specific
+    changes:
+    - debian/patches/fallback-for-getrandom.patch
+      + Add a fallback path for old kernels where getrandom is not available
+    - Disable guile and docs.
+    - Make the build-conflicts with libgmp-dev versioned.
+    - d/control: Build against gmp4 to avoid GPLv3 license issues.
+    - d/rules: ignore tests due to ftbfs on obs worker
+
+ -- Andrej Shadura <andrew.shadura@collabora.co.uk>  Wed, 19 Aug 2020 14:55:46 +0200
+
 gnutls28 (3.4.10-4ubuntu1.8) xenial; urgency=medium
 
   * d/p/50_Update-session_ticket.c-to-add-support-for-zero-leng.patch: