*: update github.com links

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

.github/ISSUE_TEMPLATE.md

@@ -1,2 +1,2 @@
 
-Please read https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md.
+Please read https://github.com/etcd-io/etcd/blob/master/Documentation/reporting_bugs.md.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,2 +1,2 @@
 
-Please read https://github.com/coreos/etcd/blob/master/CONTRIBUTING.md#contribution-flow.
+Please read https://github.com/etcd-io/etcd/blob/master/CONTRIBUTING.md#contribution-flow.

ROADMAP.md

@@ -4,7 +4,7 @@
 
 This document defines a high level roadmap for etcd development.
 
-The dates below should not be considered authoritative, but rather indicative of the projected timeline of the project. The [milestones defined in GitHub](https://github.com/coreos/etcd/milestones) represent the most up-to-date and issue-for-issue plans.
+The dates below should not be considered authoritative, but rather indicative of the projected timeline of the project. The [milestones defined in GitHub](https://github.com/etcd-io/etcd/milestones) represent the most up-to-date and issue-for-issue plans.
 
 etcd 3.3 is our current stable branch. The roadmap below outlines new features that will be added to etcd, and while subject to change, define what future stable will look like.
 

hack/patch/README.md

@@ -5,7 +5,7 @@ Handles cherry-picks of PR(s) from etcd master to a stable etcd release branch a
 ## Setup
 
 Set the `UPSTREAM_REMOTE` and `FORK_REMOTE` environment variables.
-`UPSTREAM_REMOTE` should be set to git remote name of `github.com/coreos/etcd`,
+`UPSTREAM_REMOTE` should be set to git remote name of `github.com/etcd-io/etcd`,
 and `FORK_REMOTE` should be set to the git remote name of the forked etcd
 repo (`github.com/${github-username}/etcd`). Use `git remotes -v` to
 look up the git remote names. If etcd has not been forked, create

hack/patch/cherrypick.sh

@@ -136,7 +136,7 @@ cleanbranch="${NEWBRANCHUNIQ}"
 gitamcleanup=true
 for pull in "${PULLS[@]}"; do
   echo "+++ Downloading patch to /tmp/${pull}.patch (in case you need to do this again)"
-  curl -o "/tmp/${pull}.patch" -sSL "http://github.com/coreos/etcd/pull/${pull}.patch"
+  curl -o "/tmp/${pull}.patch" -sSL "http://github.com/etcd-io/etcd/pull/${pull}.patch"
   echo
   echo "+++ About to attempt cherry pick of PR. To reattempt:"
   echo "  $ git am -3 /tmp/${pull}.patch"

hack/tls-setup/README.md

@@ -5,7 +5,7 @@ Defaults generate an ECDSA-384 root and leaf certificates for `localhost`. etcd
 **Instructions**
 
 1. Install git, go, and make
-2. Amend https://github.com/coreos/etcd/blob/master/hack/tls-setup/config/req-csr.json - IP's currently in the config should be replaced/added with IP addresses of each cluster node, please note 127.0.0.1 is always required for loopback purposes:
+2. Amend https://github.com/etcd-io/etcd/blob/master/hack/tls-setup/config/req-csr.json - IP's currently in the config should be replaced/added with IP addresses of each cluster node, please note 127.0.0.1 is always required for loopback purposes:
 ```json
 Example:
 {