*: update github links

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

CONTRIBUTING.md

@@ -14,7 +14,7 @@ etcd is Apache 2.0 licensed and accepts contributions via GitHub pull requests.
 
 ## Reporting bugs and creating issues
 
-Reporting bugs is one of the best ways to contribute. However, a good bug report has some very specific qualities, so please read over our short document on [reporting bugs](https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md) before submitting a bug report. This document might contain links to known issues, another good reason to take a look there before reporting a bug.
+Reporting bugs is one of the best ways to contribute. However, a good bug report has some very specific qualities, so please read over our short document on [reporting bugs](https://github.com/etcd-io/etcd/blob/master/Documentation/reporting_bugs.md) before submitting a bug report. This document might contain links to known issues, another good reason to take a look there before reporting a bug.
 
 ## Contribution flow
 

README.md

@@ -51,7 +51,7 @@ The easiest way to get etcd is to use one of the pre-built release binaries whic
 
 For more installation guides, please check out [play.etcd.io](http://play.etcd.io) and [operating etcd](https://github.com/etcd-io/etcd/tree/master/Documentation#operating-etcd-clusters).
 
-For those wanting to try the very latest version, [build the latest version of etcd][dl-build] from the `master` branch. This first needs [*Go*](https://golang.org/) installed (version 1.10+ is required). All development occurs on `master`, including new features and bug fixes. Bug fixes are first targeted at `master` and subsequently ported to release branches, as described in the [branch management][branch-management] guide.
+For those wanting to try the very latest version, [build the latest version of etcd][dl-build] from the `master` branch. This first needs [*Go*](https://golang.org/) installed (version 1.11+ is required). All development occurs on `master`, including new features and bug fixes. Bug fixes are first targeted at `master` and subsequently ported to release branches, as described in the [branch management][branch-management] guide.
 
 [github-release]: https://github.com/etcd-io/etcd/releases
 [branch-management]: ./Documentation/branch_management.md

clientv3/README.md

@@ -72,7 +72,7 @@ if err != nil {
 
 ## Metrics
 
-The etcd client optionally exposes RPC metrics through [go-grpc-prometheus](https://github.com/grpc-ecosystem/go-grpc-prometheus). See the [examples](https://github.com/coreos/etcd/blob/master/clientv3/example_metrics_test.go).
+The etcd client optionally exposes RPC metrics through [go-grpc-prometheus](https://github.com/grpc-ecosystem/go-grpc-prometheus). See the [examples](https://github.com/etcd-io/etcd/blob/master/clientv3/example_metrics_test.go).
 
 ## Namespacing
 

functional/README.md

@@ -4,7 +4,7 @@
 
 See [`rpcpb.Case`](https://godoc.org/github.com/coreos/etcd/functional/rpcpb#Case) for all failure cases.
 
-See [functional.yaml](https://github.com/coreos/etcd/blob/master/functional.yaml) for an example configuration.
+See [functional.yaml](https://github.com/etcd-io/etcd/blob/master/functional.yaml) for an example configuration.
 
 ### Run locally