CHANGELOG: use Go 1.9.3 with etcd 3.3.0, clarify gRPC versions

Add more breaking changes to 3.4

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

CHANGELOG-3.3.md

@@ -37,9 +37,9 @@ See [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.3.0-rc.0)
 ### Changed(Breaking Changes)
 
 - Require [Go 1.9+](https://github.com/coreos/etcd/issues/6174).
-  - Compile with *Go 1.9.2*.
+  - Compile with *Go 1.9.3*.
   - Deprecate [`golang.org/x/net/context`](https://github.com/coreos/etcd/pull/8511).
-- Require [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) [**`v1.7.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.4) or [**`v1.7.5+`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5).
+- Require [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) [**`v1.7.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.4) or [**`v1.7.5`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5).
   - Deprecate [`metadata.Incoming/OutgoingContext`](https://github.com/coreos/etcd/pull/7896).
   - Deprecate `grpclog.Logger`, upgrade to [`grpclog.LoggerV2`](https://github.com/coreos/etcd/pull/8533).
   - Deprecate [`grpc.ErrClientConnTimeout`](https://github.com/coreos/etcd/pull/8505) errors in `clientv3`.
@@ -72,7 +72,7 @@ See [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.3.0-rc.0)
   - Define [`etcdhttp.Health`](https://godoc.org/github.com/coreos/etcd/etcdserver/api/etcdhttp#Health) struct with JSON encoder.
   - Note that `"health"` field is [`string` type, not `bool`](https://github.com/coreos/etcd/pull/9143).
     - e.g. `{"health":"false"}`, `{"health":"true"}`
-  - [Remove `"errors"` field](https://github.com/coreos/etcd/pull/9162) from `v3.3.0-rc.3` (did exist only in `v3.3.0-rc.0`, `v3.3.0-rc.1`, `v3.3.0-rc.2`).
+  - [Remove `"errors"` field](https://github.com/coreos/etcd/pull/9162) since `v3.3.0-rc.3` (did exist only in `v3.3.0-rc.0`, `v3.3.0-rc.1`, `v3.3.0-rc.2`).
 - Move [logging setup to embed package](https://github.com/coreos/etcd/pull/8810)
   - Disable gRPC server info-level logs by default (can be enabled with `etcd --debug` flag).
 - Use [monotonic time in Go 1.9](https://github.com/coreos/etcd/pull/8507) for `lease` package.

CHANGELOG-3.4.md

@@ -10,10 +10,15 @@
   - [AppC was officially suspended](https://github.com/appc/spec#-disclaimer-), as of late 2016.
   - [`acbuild`](https://github.com/containers/build#this-project-is-currently-unmaintained) is not maintained anymore.
   - `*.aci` files are not available from `v3.4` release.
+- Exit on [empty hosts in advertise URLs](TODO).
+  - Address [advertise client URLs accepts empty hosts](https://github.com/coreos/etcd/issues/8379).
+  - e.g. `--advertise-client-urls=http://:2379`.
+- Exit on [shadowed environment variables](TODO).
+  - Address [error on shadowed environment variables](https://github.com/coreos/etcd/issues/8380).
 - Migrate dependency management tool from `glide` to [`golang/dep`](https://github.com/coreos/etcd/pull/9155).
   - Move `cmd/vendor` directory to `vendor` at repository root.
   - Remove recursive symlinks in `cmd` directory.
-  - Now `go get/install/build` on `etcd` packages (e.g. `clientv3`, `tools/benchmark`) enforce builds with `vendor` directory.
+  - Now `go get/install/build` on `etcd` packages (e.g. `clientv3`, `tools/benchmark`) enforce builds with etcd `vendor` directory.
 
 ### Added(API)