CHANGELOG: update dates

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

CHANGELOG-3.3.md

@@ -9,7 +9,7 @@ The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.
 <hr>
 
 
-## [v3.3.21](https://github.com/etcd-io/etcd/releases/tag/v3.3.21) (TBD)
+## [v3.3.21](https://github.com/etcd-io/etcd/releases/tag/v3.3.21) (2020-05-18)
 
 See [code changes](https://github.com/etcd-io/etcd/compare/v3.3.20...v3.3.21) and [v3.3 upgrade guide](https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes.
 
@@ -23,6 +23,7 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.3.20...v3.3.21) an
 
 ### etcd server
 
+- Improve logging around snapshot send and receive.
 - [Add log when etcdserver failed to apply command](https://github.com/etcd-io/etcd/pull/11670).
 - [Fix deadlock bug in mvcc](https://github.com/etcd-io/etcd/pull/11817).
 - Fix [inconsistency between WAL and server snapshot](https://github.com/etcd-io/etcd/pull/11888).

CHANGELOG-3.4.md

@@ -9,7 +9,7 @@ The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.
 <hr>
 
 
-## [v3.4.8](https://github.com/etcd-io/etcd/releases/tag/v3.4.8) (TBD)
+## [v3.4.8](https://github.com/etcd-io/etcd/releases/tag/v3.4.8) (2020-05-18)
 
 See [code changes](https://github.com/etcd-io/etcd/compare/v3.4.7...v3.4.8) and [v3.4 upgrade guide](https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_4.md) for any breaking changes.
 
@@ -23,6 +23,7 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.4.7...v3.4.8) and
 
 ### etcd server
 
+- Improve logging around snapshot send and receive.
 - [Add log when etcdserver failed to apply command](https://github.com/etcd-io/etcd/pull/11670).
 - [Fix deadlock bug in mvcc](https://github.com/etcd-io/etcd/pull/11817).
 - Fix [inconsistency between WAL and server snapshot](https://github.com/etcd-io/etcd/pull/11888).

CHANGELOG-3.5.md

@@ -118,6 +118,7 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - Fix [inconsistency between WAL and server snapshot](https://github.com/etcd-io/etcd/pull/11888).
   - Previously, server restore fails if it had crashed after persisting raft hard state but before saving snapshot.
   - See https://github.com/etcd-io/etcd/issues/10219 for more.
+- Improve logging around snapshot send and receive.
 
 ### Package `embed`
 
@@ -127,9 +128,9 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 
 ### Package `clientv3`
 
-- Add [TryLock](https://github.com/etcd-io/etcd/pull/11104) method to `clientv3/concurrency/Mutex`. A non-blocking method on `Mutex` which does not wait to get lock on the Mutex, returns immediately if Mutex is locked by another session.
+- Add [`TryLock`](https://github.com/etcd-io/etcd/pull/11104) method to `clientv3/concurrency/Mutex`. A non-blocking method on `Mutex` which does not wait to get lock on the Mutex, returns immediately if Mutex is locked by another session.
 - Fix [client balancer failover against multiple endpoints](https://github.com/etcd-io/etcd/pull/11184).
-  - Fix ["kube-apiserver: failover on multi-member etcd cluster fails certificate check on DNS mismatch" (kubernetes#83028)](https://github.com/kubernetes/kubernetes/issues/83028).
+  - Fix [`"kube-apiserver: failover on multi-member etcd cluster fails certificate check on DNS mismatch"`](https://github.com/kubernetes/kubernetes/issues/83028).
 - Fix [IPv6 endpoint parsing in client](https://github.com/etcd-io/etcd/pull/11211).
   - Fix ["1.16: etcd client does not parse IPv6 addresses correctly when members are joining" (kubernetes#83550)](https://github.com/kubernetes/kubernetes/issues/83550).
 - Fix [errors caused by grpc changing balancer/resolver API](https://github.com/etcd-io/etcd/pull/11564). This change is compatible with grpc >= [v1.26.0](https://github.com/grpc/grpc-go/releases/tag/v1.26.0), but is not compatible with < v1.26.0 version.