Updated debian changelog for version 0.1.1

debian/changelog

+swh-model (0.1.1-1~swh1) unstable-swh; urgency=medium
+
+  * New upstream release 0.1.1     - (tagged by Antoine R. Dumont
+    (@ardumont) <ardumont@softwareheritage.org> on 2020-05-05 14:43:40
+    +0200)
+  * Upstream changes:     - v0.1.1     - Make aware_datetimes() generate
+    only ISO8601-encodable datetimes
+
+ -- Software Heritage autobuilder (on jenkins-debian1) <jenkins@jenkins-debian1.internal.softwareheritage.org>  Tue, 05 May 2020 12:45:37 +0000
+
 swh-model (0.1.0-1~swh1) unstable-swh; urgency=medium
 
   * New upstream release 0.1.0     - (tagged by Stefano Zacchiroli