Updated debian changelog for version 0.0.49

debian/changelog

+swh-model (0.0.49-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 0.0.49     - (tagged by Nicolas Dandrimont
+    <nicolas@dandrimont.eu> on 2019-10-23 14:28:01 +0200)
+  * Upstream changes:     - Release swh.model v0.0.49     - Add symbolic
+    refs to swh identify -t snapshot     - Cleanup
+    model.BaseModel.to_dict() recursion
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Wed, 23 Oct 2019 12:30:41 +0000
+
 swh-model (0.0.48-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 0.0.48     - (tagged by Nicolas Dandrimont