stash: require a clean index to apply

diff --git a/RelNotes b/RelNotes
index 8abe4c292b53249d22252f54c877a798ff604327..c5fa3efb98246d99bdf736237b7cf759f01a1657 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.5.1.5.txt
\ No newline at end of file
+Documentation/RelNotes/2.2.2.txt
\ No newline at end of file