Merge pull request #13 from unistack-org/master

merge master

etcd.go

@@ -22,10 +22,7 @@ import (
 	"go.unistack.org/micro/v3/register"
 )
 
-const (
+var DefaultPrefix = "/micro/register/"
-	DefaultPrefix = "/micro/register/"
-	DefaultDomain = "micro"
-)
 
 var _ register.Register = &etcdRegister{}