dl: add go1.16.3 and go1.15.11

For golang/go#45334.
For golang/go#45333.

Change-Id: I4a13b5c954b79ab0c449074b18acf3ee40c6fc09
Reviewed-on: https://go-review.googlesource.com/c/dl/+/306595
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/go1.15.11/main.go b/go1.15.11/main.go
new file mode 100644
index 0000000..701ad20
--- /dev/null
+++ b/go1.15.11/main.go
@@ -0,0 +1,24 @@
+// Copyright 2021 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 go1.15.11 command runs the go command from Go 1.15.11.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.15.11
+//     $ go1.15.11 download
+//
+// And then use the go1.15.11 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/devel/release.html#go1.15.minor
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.15.11")
+}
diff --git a/go1.16.3/main.go b/go1.16.3/main.go
new file mode 100644
index 0000000..e8d3258
--- /dev/null
+++ b/go1.16.3/main.go
@@ -0,0 +1,24 @@
+// Copyright 2021 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 go1.16.3 command runs the go command from Go 1.16.3.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.16.3
+//     $ go1.16.3 download
+//
+// And then use the go1.16.3 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/devel/release.html#go1.16.minor
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.16.3")
+}