Update OWNERS, OWNERS_ALIASES and SECURITY_CONTACTS.

OWNERS

@@ -1,6 +1,5 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  # TODO: in your repo created from this template, you should replace the
+  - brendandburns
-  # steering-committee with a list of project owners, see the doc linked above.
+  - ityuhui
-  - steering-committee

OWNERS_ALIASES

@@ -1,15 +0,0 @@
-# See the OWNERS docs at https://go.k8s.io/owners#owners_aliases
-
-aliases:
-  # TODO: remove this alias, it will go stale in your repo, and in your repo
-  # you should have your own set of approvers (see OWNERS)
-  # in the original template repo, we must maintain this list to approve changes
-  # to the template itself
-  steering-committee:
-    - cblecker
-    - derekwaynecarr
-    - dims
-    - nikhita
-    - parispittman
-    - spiffxp
-    - timothysc

SECURITY_CONTACTS

@@ -10,5 +10,5 @@
 # DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
 # INSTRUCTIONS AT https://kubernetes.io/security/
 
-bob
+brendandburns
-alice
+ityuhui