fix import paths for v2 release

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

config/encoder/yaml/yaml.go

@@ -2,7 +2,7 @@ package yaml
 
 import (
 	"github.com/ghodss/yaml"
-	"github.com/micro/go-micro/config/encoder"
+	"github.com/micro/go-micro/v2/config/encoder"
 )
 
 type yamlEncoder struct{}