Updated debian changelog for version 0.3.1

debian/changelog

+swh-vault (0.3.1-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 0.3.1     - (tagged by Antoine R. Dumont
+    (@ardumont) <ardumont@softwareheritage.org> on 2020-11-17 17:46:37
+    +0100)
+  * Upstream changes:     - v0.3.1     - test_server: Simplify test
+    server initialization to the minimum
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Tue, 17 Nov 2020 16:54:22 +0000
+
 swh-vault (0.3.0-1~swh2) unstable-swh; urgency=medium
 
   * Fix dependency release