[#xx] object: Add newline at the file's end

* Non-functional change.

Signed-off-by: Airat Arifullin <aarifullin@yadro.com>

object/service.proto

@@ -816,4 +816,4 @@ message PutSingleResponse {
   // authenticate the nodes of the message route and check the correctness of
   // transmission.
   neo.fs.v2.session.ResponseVerificationHeader verify_header = 3;
-}
+}