dl: add go1.13.6 and go1.12.15

Change-Id: Ibfe011340d2b5605e9c79f711dc45c3685f694fc
Reviewed-on: https://go-review.googlesource.com/c/dl/+/214197
Run-TryBot: Carlos Amedee <carlos@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/golang.org/dl/go1.12.15/main.go b/src/golang.org/dl/go1.12.15/main.go
new file mode 100644
index 0000000..d8d32ad
--- /dev/null
+++ b/src/golang.org/dl/go1.12.15/main.go
@@ -0,0 +1,24 @@
+// Copyright 2020 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 go1.12.15 command runs the go command from Go 1.12.15.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.12.15
+//     $ go1.12.15 download
+//
+// And then use the go1.12.15 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/devel/release.html#go1.12.minor
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.12.15")
+}
diff --git a/src/golang.org/dl/go1.13.6/main.go b/src/golang.org/dl/go1.13.6/main.go
new file mode 100644
index 0000000..39531a3
--- /dev/null
+++ b/src/golang.org/dl/go1.13.6/main.go
@@ -0,0 +1,24 @@
+// Copyright 2020 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 go1.13.6 command runs the go command from Go 1.13.6.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.13.6
+//     $ go1.13.6 download
+//
+// And then use the go1.13.6 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/devel/release.html#go1.13.minor
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.13.6")
+}