Update README.md

README.md

@@ -22,6 +22,9 @@ We created key value store using gRPC in C++. In that Clinet can PUT, GET, DEL o
 ## How to log
 copy and run the below line before execution of the server<br>
 export GRPC_TRACE=all
+OR
+export GRPC_VERBOSITY=DEBUG
+(It's depend on version of gRPC)
 
 ## Functions
 1. PUT := it takes key and value from client and store it on the server.