Add changelog entry for 0.9.1.

debian/changelog

@@ -1,9 +1,10 @@
-dulwich (0.9.0-2) UNRELEASED; urgency=low
+dulwich (0.9.1-1) UNRELEASED; urgency=low
 
   * Bump standards version to 3.9.4.
   * Add Vcs-Browser header.
+  * Add changelog entry for 0.9.1.
 
- -- Jelmer Vernooij <jelmer@debian.org>  Fri, 31 May 2013 01:15:20 +0100
+ -- Jelmer Vernooij <jelmer@debian.org>  Sun, 22 Sep 2013 21:31:40 +0100
 
 dulwich (0.9.0-1) unstable; urgency=low