t0001: use test_must_fail

diff --git a/RelNotes b/RelNotes
index 155555ef6af91ee7309a047f8280c1c57cac1e62..bb52cf9476df53ddb9788f16082e2e92e76a4db5 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.8.2.3.txt
\ No newline at end of file
+Documentation/RelNotes/1.9.0.txt
\ No newline at end of file