修正proto中空格indent为tab

Cpp/Platform/Rpc/Echo.proto

@@ -2,17 +2,17 @@ package Egametang;
 
 option cc_generic_services = true;
 
-message EchoRequest 
+message EchoRequest
 {
 	required int32 num = 1;
 };
 
-message EchoResponse 
+message EchoResponse
 {
 	required int32 num = 1;
 };
 
-service EchoService 
+service EchoService
 {
-  rpc Echo(EchoRequest) returns (EchoResponse);
+	rpc Echo(EchoRequest) returns (EchoResponse);
 };