releasing package dulwich version 0.18.5-1

debian/changelog

@@ -1,4 +1,4 @@
-dulwich (0.18.5-1) UNRELEASED; urgency=high
+dulwich (0.18.5-1) unstable; urgency=high
 
   * New upstream release.
    + Prevents setting SSH arguments from SSH URLs when using SSH through a