[#68] Makefile: Use gofumpt for formatting

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

object/attributes_test.go

@@ -10,7 +10,7 @@ import (
 func TestSetNotification(t *testing.T) {
 	o := new(Object)
 
-	var ni = NotificationInfo{
+	ni := NotificationInfo{
 		epoch: 10,
 		topic: "test",
 	}

object/types.go

@@ -318,8 +318,7 @@ type PutSingleRequest struct {
 	session.RequestHeaders
 }
 
-type PutSingleResponseBody struct {
-}
+type PutSingleResponseBody struct{}
 
 type PutSingleResponse struct {
 	body *PutSingleResponseBody