[release-branch.go1.9] go1.9.1

Change-Id: I711b38738a7f6fade42a2821908234940f3cf280
Reviewed-on: https://go-review.googlesource.com/68233
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/VERSION b/VERSION
index f213576..66a2bee 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.9
\ No newline at end of file
+go1.9.1
\ No newline at end of file