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

Change-Id: I0899ec0150f2a051b7572879b446a8548f742ae0
Reviewed-on: https://go-review.googlesource.com/58731
Run-TryBot: Chris Broadfoot <cbro@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/VERSION b/VERSION
index 0a14d06..f213576 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-go1.9rc2
\ No newline at end of file
+go1.9
\ No newline at end of file