New upstream version.

debian/changelog

@@ -1,3 +1,9 @@
+dulwich (0.19.11-1) UNRELEASED; urgency=medium
+
+  * New upstream version.
+
+ -- Jelmer Vernooij <jelmer@debian.org>  Thu, 07 Feb 2019 03:13:59 +0000
+
 dulwich (0.19.10-1) unstable; urgency=medium
 
   * Suggest python{,3}-gpg, for tag signing support.