Add manual pytz dependency

debian/changelog

+swh-model (0.0.51-1~swh3) unstable-swh; urgency=medium
+
+  * Add manual pytz dependency
+
+ -- Nicolas Dandrimont <olasd@debian.org>  Wed, 30 Oct 2019 17:52:33 +0100
+
 swh-model (0.0.51-1~swh2) unstable-swh; urgency=medium
 
   * Add missing build-dependency on pytz

debian/control

@@ -19,7 +19,7 @@ Homepage: https://forge.softwareheritage.org/diffusion/DMOD/
 
 Package: python3-swh.model
 Architecture: all
-Depends: ${misc:Depends}, ${python3:Depends}
+Depends: ${misc:Depends}, ${python3:Depends}, python3-tz
 Breaks: python3-swh.loader.core (<< 0.0.16~),
         python3-swh.loader.dir (<< 0.0.28~),
         python3-swh.loader.svn (<< 0.0.28~)