stash: require a clean index to apply

diff --git a/RelNotes b/RelNotes
index a677737b90d7f1cc550d632a8e983e6e7df109fb..c5fa3efb98246d99bdf736237b7cf759f01a1657 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes-1.6.0.3.txt
\ No newline at end of file
+Documentation/RelNotes/2.2.2.txt
\ No newline at end of file