Use proto3 for ProtoTest.proto

Author: artembilan

spring-integration-core/src/test/proto/ProtoTest.proto

@@ -1,9 +1,8 @@
-syntax = "proto2";
+syntax = "proto3";
 
-package tutorial;
+package org.springframework.integration.transformer.proto;
 
 option java_multiple_files = true;
-option java_package = "org.springframework.integration.transformer.proto";
 option java_outer_classname = "TestProtos";
 
 message TestClass1 {