Add 9.2 branch to git_changelog's list.

src/tools/git_changelog

@@ -38,7 +38,7 @@ require IPC::Open2;
 # (We could get this from "git branches", but not worth the trouble.)
 # NB: master must be first!
 my @BRANCHES = qw(master
-    REL9_1_STABLE REL9_0_STABLE
+    REL9_2_STABLE REL9_1_STABLE REL9_0_STABLE
     REL8_4_STABLE REL8_3_STABLE REL8_2_STABLE REL8_1_STABLE REL8_0_STABLE
     REL7_4_STABLE REL7_3_STABLE REL7_2_STABLE REL7_1_STABLE REL7_0_PATCHES
     REL6_5_PATCHES REL6_4);