remove public visibility of codec

Signed-off-by: ekexium <[email protected]>

Author: ekexium

src/lib.rs

@@ -97,7 +97,7 @@ mod proptests;
 extern crate log;
 
 #[doc(inline)]
-pub use crate::kv::{codec, BoundRange, Key, KvPair, ToOwnedRange, Value};
+pub use crate::kv::{BoundRange, Key, KvPair, ToOwnedRange, Value};
 #[doc(inline)]
 pub use crate::raw::{Client as RawClient, ColumnFamily};
 #[doc(inline)]

src/pd/client.rs

@@ -1,7 +1,7 @@
 // Copyright 2018 TiKV Project Authors. Licensed under Apache-2.0.
 
 use crate::{
-    codec, compat::stream_fn, pd::RetryClient, store::Store, BoundRange, Config, Key, Region,
+    compat::stream_fn, kv::codec, pd::RetryClient, store::Store, BoundRange, Config, Key, Region,
     RegionId, Result, SecurityManager, Timestamp,
 };
 use async_trait::async_trait;