[release-branch.go1.12] go1.12rc1

Change-Id: Iac838b852061a8469e4e201670a589fa2bed9f04
Reviewed-on: https://go-review.googlesource.com/c/161900
Run-TryBot: Andrew Bonventre <andybons@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..d521604
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+go1.12rc1
\ No newline at end of file