abiword: add update script

pkgs/by-name/ab/abiword/package.nix

@@ -20,6 +20,7 @@
 , libxslt
 , goffice
 , wrapGAppsHook3
+, gitUpdater
 }:
 
 stdenv.mkDerivation rec {
@@ -77,6 +78,10 @@ stdenv.mkDerivation rec {
     ./autogen-common.sh
   '';
 
+  passthru.updateScript = gitUpdater {
+    rev-prefix = "release-";
+  };
+
   meta = with lib; {
     description = "Word processing program, similar to Microsoft Word";
     mainProgram = "abiword";