write_index: optionally allow broken null sha1s

diff --git a/RelNotes b/RelNotes
index 509b3f6044d1f0f5091c8e65826747d524ab12d0..a95f779aec5db3b3cd63c5c6f7c0f140dd51d366 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.5.3.7.txt
\ No newline at end of file
+Documentation/RelNotes/1.8.3.4.txt
\ No newline at end of file