CHANGELOG: bump to include etcd-io#11694

Signed-off-by: Sam Batschelet <[email protected]>

Author: hexfusion

Diff for: CHANGELOG-3.3.md

@@ -17,6 +17,10 @@ The minimum recommended etcd versions to run in **production** are 3.2.28+, 3.3.
 
 - Fix [`etcdctl member add`](https://github.com/etcd-io/etcd/pull/11638) command to prevent potential timeout.
 
+### gRPC Proxy
+
+- Fix [`panic on error`](https://github.com/etcd-io/etcd/pull/11694) for metrics handler. 
+
 <hr>
 
 ## v3.3.18 (2019-11-26)

Diff for: CHANGELOG-3.4.md

@@ -19,6 +19,9 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.4.4...v3.4.5) and
 
 - Fix [`etcdctl member add`](https://github.com/etcd-io/etcd/pull/11638) command to prevent potential timeout.
 
+### gRPC Proxy
+ 
+- Fix [`panic on error`](https://github.com/etcd-io/etcd/pull/11694) for metrics handler.
 
 <hr>