dl: add go1.11.3 and go1.10.6

Go 1.11.3 and 1.10.6 have been released, add commands for them.

Reference: https://groups.google.com/d/msg/golang-announce/Kw31K8G7Fi0/z2olKn-QCAAJ.

Change-Id: I0aafcff9517f17d59fb2bb945db0e22e294f1fd2
Reviewed-on: https://go-review.googlesource.com/c/154198
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
diff --git a/go1.10.6/main.go b/go1.10.6/main.go
new file mode 100644
index 0000000..7b2246a
--- /dev/null
+++ b/go1.10.6/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 go1.10.6 command runs the go command from Go 1.10.6.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.10.6
+//     $ go1.10.6 download
+//
+// And then use the go1.10.6 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/go1.10
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.10.6")
+}
diff --git a/go1.11.3/main.go b/go1.11.3/main.go
new file mode 100644
index 0000000..d64dc1a
--- /dev/null
+++ b/go1.11.3/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 go1.11.3 command runs the go command from Go 1.11.3.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.11.3
+//     $ go1.11.3 download
+//
+// And then use the go1.11.3 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("go1.11.3")
+}