dl: add go1.11.1

Go 1.11.1 has been released, so add a command for it.

Reference: https://golang.org/doc/devel/release.html#go1.11.minor.

Change-Id: I32167ed75fe04a84ba4cdfa1fc9172238d67d88d
Reviewed-on: https://go-review.googlesource.com/139017
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/go1.11.1/main.go b/go1.11.1/main.go
new file mode 100644
index 0000000..7544f19
--- /dev/null
+++ b/go1.11.1/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 go1.11.1 command runs the go command from Go 1.11.1.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.11.1
+//     $ go1.11.1 download
+//
+// And then use the go1.11.1 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/go1.11
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.11.1")
+}