version: add go1.11beta1

Change-Id: I75c08d170eab8452e305c6f35f625c713e5b0657
Reviewed-on: https://go-review.googlesource.com/121019
Reviewed-by: Andrew Bonventre <[email protected]>

Author: andybons

version/go1.11beta1/main.go

@@ -0,0 +1,24 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The go1.11beta1 command runs the go command from go1.11beta1.
+//
+// To install, run:
+//
+//     $ go get golang.org/x/build/version/go1.11beta1
+//     $ go1.11beta1 download
+//
+// And then use the go1.11beta1 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/go1.11beta1
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/x/build/version"
+
+func main() {
+	version.Run("go1.11beta1")
+}