Update draft release notes to 2.2

diff --git a/RelNotes b/RelNotes
index 0e72d3b56498d107db87ebd0e4b4c0574b8479c3..c473b35ad95f0fc1ff05c19493ded96ca6a48f55 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.9.1.txt
\ No newline at end of file
+Documentation/RelNotes/2.2.0.txt
\ No newline at end of file