dl: add go1.13rc1

Change-Id: I2d98f699060e761f26ab590641061dc9f90e1918
Reviewed-on: https://go-review.googlesource.com/c/dl/+/191161
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/go1.13rc1/main.go b/go1.13rc1/main.go
new file mode 100644
index 0000000..73c0c72
--- /dev/null
+++ b/go1.13rc1/main.go
@@ -0,0 +1,24 @@
+// Copyright 2019 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 go1.13rc1 command runs the go command from Go 1.13rc1.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.13rc1
+//     $ go1.13rc1 download
+//
+// And then use the go1.13rc1 command as if it were your normal go
+// command.
+//
+// See the release notes at https://tip.golang.org/doc/go1.13
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.13rc1")
+}