unir: Remove old maintainers, add new ones

I'm leaving Docker Inc. so it'd probably be best to remove me from the
automerge capabilities. I've also taken the liberty to remove other old
maintainers.

Signed-off-by: Eli Uriegas <[email protected]>

Author: seemethere

.unir.yml

@@ -1,10 +1,9 @@
 # The list of people who can trigger an auto-merge with approvals
 whitelist:
-    - seemethere
     - andrewhsu
-    - jose-bigio
-    - corbin-coleman
+    - droopy4096
     - thaJeztah
+    - zelahi
 
 # At least 2 approvals are needed for auto-merging
 approvals_needed: 2