Add prb to junit OWNERS.

Test: n/a
Change-Id: I8ae0ade50e82fec4b53451e46b8ffa29ba4f3e20
diff --git a/OWNERS b/OWNERS
index d8f3a85..dd4649a 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,3 @@
 paulduffin@google.com
 jgaillard@google.com
+prb@google.com