the documentation has to go above the package

This makes the documentation in the main.go readable on the godoc.org
website and through the godoc command.

command.go

@@ -1,6 +1,7 @@
-// Handler to make management of subcommands easier.
 package main
 
+// Handler to make management of subcommands easier.
+
 import (
 	"flag"
 	"fmt"

main.go

@@ -1,8 +1,7 @@
-package main
-
 // This package builds a binary which helps to generate
 // private keys, public keys, certificates and also
 // includes functionality to sign and verify messages.
+package main
 
 import (
 	"crypto"