default to prost

Signed-off-by: Ping Yu <yuping@pingcap.com>

Author: pingyu

Cargo.toml

@@ -9,7 +9,7 @@ description = "The Rust language implementation of TiKV client."
 edition = "2018"
 
 [features]
-default = [ "protobuf-codec", "prometheus/process" ]
+default = [ "prost-codec", "prometheus/process" ]
 # Enable integration tests with a running TiKV and PD instance.
 # Use $PD_ADDRS, comma separated, to set the addresses the tests use.
 integration-tests = []