CHANGELOG: update Go version

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

CHANGELOG-3.3.md

@@ -27,7 +27,8 @@ NOTE: This patch release had to include some new features from 3.4, while trying
     - Fix ["kube-apiserver 1.13.x refuses to work when first etcd-server is not available" (kubernetes#72102)](https://github.com/kubernetes/kubernetes/issues/72102).
   - [The new client balancer](https://github.com/etcd-io/etcd/blob/master/Documentation/learning/design-client.md) uses an asynchronous resolver to pass endpoints to the gRPC dial function. to block until the underlying connection is up, pass `grpc.WithBlock()` to `clientv3.Config.DialOptions`.
 - Require [*Go 1.12+*](https://github.com/etcd-io/etcd/pull/10045).
-  - Compile with [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ).
+- Compile with Go 1.12.9 including [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ) security fixes.
+  - See [*Go 1.12 release page*](https://golang.org/doc/devel/release.html#go1.12) for more.
 - Migrate dependency management tool from `glide` to [Go module](https://github.com/etcd-io/etcd/pull/10063).
   - <= 3.3 puts `vendor` directory under `cmd/vendor` directory to [prevent conflicting transitive dependencies](https://github.com/etcd-io/etcd/issues/4913).
   - 3.4 moves `cmd/vendor` directory to `vendor` at repository root.
@@ -105,7 +106,7 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 ### Go
 
 - Require [*Go 1.12+*](https://github.com/etcd-io/etcd/pull/10045).
-- Compile with [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ).
+- Compile with Go 1.12.9 including [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ) security fixes.
   - See [*Go 1.12 release page*](https://golang.org/doc/devel/release.html#go1.12) for more.
 
 <hr>

CHANGELOG-3.4.md

@@ -89,7 +89,7 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.3.0...v3.4.0) and
   - Fix [gRPC panic "send on closed channel](https://github.com/etcd-io/etcd/issues/9956).
   - [The new client balancer](https://github.com/etcd-io/etcd/blob/master/Documentation/learning/design-client.md) uses an asynchronous resolver to pass endpoints to the gRPC dial function. to block until the underlying connection is up, pass `grpc.WithBlock()` to `clientv3.Config.DialOptions`.
 - Require [*Go 1.12+*](https://github.com/etcd-io/etcd/pull/10045).
-  - Compile with [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ).
+  - Compile with Go 1.12.9 including [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ) security fixes.
 - Migrate dependency management tool from `glide` to [Go module](https://github.com/etcd-io/etcd/pull/10063).
   - <= 3.3 puts `vendor` directory under `cmd/vendor` directory to [prevent conflicting transitive dependencies](https://github.com/etcd-io/etcd/issues/4913).
   - 3.4 moves `cmd/vendor` directory to `vendor` at repository root.
@@ -593,7 +593,7 @@ Note: **v3.5 will deprecate `etcd --log-package-levels` flag for `capnslog`**; `
 ### Go
 
 - Require [*Go 1.12+*](https://github.com/etcd-io/etcd/pull/10045).
-- Compile with [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ).
+- Compile with Go 1.12.9 including [*Go 1.12.8*](https://groups.google.com/d/msg/golang-announce/65QixT3tcmg/DrFiG6vvCwAJ) security fixes.
   - See [*Go 1.12 release page*](https://golang.org/doc/devel/release.html#go1.12) for more.
 
 ### Dockerfile