version: add go1.8rc2

Change-Id: I85e9b07de440f160dc3f7a5c22907e4f38a73db6
Reviewed-on: https://go-review.googlesource.com/35310
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

version/go1.8rc2/main.go

@@ -0,0 +1,24 @@
+// Copyright 2016 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 go1.8rc2 command runs the go command from go1.8rc2.
+//
+// To install, run:
+//
+//     $ go get golang.org/x/build/version/go1.8rc2
+//     $ go1.8rc2 download
+//
+// And then use the go1.8rc2 command as if it were your normal go
+// command.
+//
+// See the release notes at https://beta.golang.org/doc/go1.8
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/x/build/version"
+
+func main() {
+	version.Run("go1.8rc2")
+}