Add denicija@ and kthelgason@ as owners of webrtc/sdk/objc

It's time.

TBR=denicija@webrtc.org,kthelgason@webrtc.org
NOTRY=TRUE
BUG=NONE

Review-Url: https://codereview.webrtc.org/2994493002
Cr-Commit-Position: refs/heads/master@{#19218}
diff --git a/webrtc/sdk/objc/OWNERS b/webrtc/sdk/objc/OWNERS
index a229fdb..17414d1 100644
--- a/webrtc/sdk/objc/OWNERS
+++ b/webrtc/sdk/objc/OWNERS
@@ -1,3 +1,5 @@
+denicija@webrtc.org
+kthelgason@webrtc.org
 magjed@webrtc.org
 tkchin@webrtc.org