Updated debian changelog for version 0.3.0

debian/changelog

+swh-lister (0.3.0-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 0.3.0     - (tagged by Antoine R. Dumont
+    (@ardumont) <ardumont@softwareheritage.org> on 2020-10-19 09:50:43
+    +0200)
+  * Upstream changes:     - v0.3.0     - lister.config: Adapt scheduler
+    configuration structure     - drop mock_get_scheduler which creates
+    indirection for no good reason
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Mon, 19 Oct 2020 07:56:17 +0000
+
 swh-lister (0.2.1-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 0.2.1     - (tagged by Antoine R. Dumont