filter-branch: Fix fatal error on bare repositories

diff --git a/RelNotes b/RelNotes
index 8abe4c292b53249d22252f54c877a798ff604327..da6e81321a332fc7c7229c04e438f4161f27755d 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.5.1.5.txt
\ No newline at end of file
+Documentation/RelNotes-1.6.1.2.txt
\ No newline at end of file