fix broken build

cmd/guerrillad/serve.go

@@ -7,7 +7,6 @@ import (
 	"github.com/flashmob/go-guerrilla"
 	"github.com/flashmob/go-guerrilla/backends"
 	"github.com/flashmob/go-guerrilla/log"
-	_ "github.com/flashmob/maildiranasaurus"
 	"github.com/spf13/cobra"
 	"io/ioutil"
 	"os"