Add warning not to edit generated files by hand.

dcps/internetgateway1/internetgateway1.go

@@ -1,5 +1,7 @@
 package internetgateway1
 
+// Generated file - do not edit by hand. See README.md
+
 import (
 	"time"
 

dcps/internetgateway2/internetgateway2.go

@@ -1,5 +1,7 @@
 package internetgateway2
 
+// Generated file - do not edit by hand. See README.md
+
 import (
 	"time"
 

gotasks/specgen_task.go

@@ -423,6 +423,9 @@ var packageTmpl = template.Must(template.New("package").Parse(`{{$name := .Metad
 
 package {{$name}}
 
+// Generated file - do not edit by hand. See README.md
+
+
 import (
 	"time"