design/25530-notary: leave forwarding pointer

Change-Id: Ic8ec73597d666c4c100b67e4cbb155baed71c9bc
Reviewed-on: https://go-review.googlesource.com/c/proposal/+/173543
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/design/25530-notary.md b/design/25530-notary.md
new file mode 100644
index 0000000..ec81ab7
--- /dev/null
+++ b/design/25530-notary.md
@@ -0,0 +1 @@
+Moved to [golang.org/design/25530-sumdb](https://golang.org/design/25530-sumdb).