Update CHANGES.md

CHANGES.md

@@ -49,6 +49,8 @@ To be released.
  -  Added .NET Core 2.2 as a targeted framework.  [[#209], [#561]]
  -  `TurnClient.AcceptRelayedStreamAsync()` became to ignore disconnected
     connections.  [[#469]]
+ -  `KademliaProtocol<T>.RefreshTableAsync()` became to validate only staled
+    peers.  [[#568], [#593]]
 
 ### Bug fixes
 
@@ -67,6 +69,8 @@ To be released.
  -  Fixed a bug where `Swarm<T>` renders actions in same block multiple times
     when reorg happens.  [[#579]]
  -  `LiteDBStore` became to guarantee atomicity of storing blocks. [[#584]]
+ -  Fixed a bug where `KademliaProtocol<T>.RefreshTableAsync()` didn't remove
+    staled peers.  [[#568], [#593]]
 
 [#209]: https://github.com/planetarium/libplanet/issues/209
 [#405]: https://github.com/planetarium/libplanet/issues/405
@@ -88,12 +92,14 @@ To be released.
 [#562]: https://github.com/planetarium/libplanet/pull/562
 [#563]: https://github.com/planetarium/libplanet/pull/563
 [#566]: https://github.com/planetarium/libplanet/pull/566
+[#568]: https://github.com/planetarium/libplanet/issues/568
 [#575]: https://github.com/planetarium/libplanet/pull/575
 [#576]: https://github.com/planetarium/libplanet/pull/576
 [#579]: https://github.com/planetarium/libplanet/pull/579
 [#581]: https://github.com/planetarium/libplanet/pull/581
 [#583]: https://github.com/planetarium/libplanet/pull/583
 [#584]: https://github.com/planetarium/libplanet/pull/584
+[#593]: https://github.com/planetarium/libplanet/pull/593
 
 
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