fix protocol version

producer/api/cpp/src/receiver_discovery_service.cpp

@@ -11,7 +11,7 @@
 namespace  asapo {
 
 const std::string ReceiverDiscoveryService::kServiceEndpointSuffix = "/asapo-discovery/"+kProducerProtocol.GetDiscoveryVersion()
-    +"/asapo-receiver?protocol="+kConsumerProtocol.GetVersion();
+    +"/asapo-receiver?protocol="+kProducerProtocol.GetVersion();
 
 ReceiverDiscoveryService::ReceiverDiscoveryService(std::string endpoint, uint64_t update_frequency_ms): httpclient__{DefaultHttpClient()},
     log__{GetDefaultProducerLogger()},