Add Nan Zhou as a reviewer

Signed-off-by: Nan Zhou <nanzhoumails@gmail.com>
Change-Id: I16ba4436099c959cff16e67a4e8f1b9bd2ed047e
diff --git a/OWNERS b/OWNERS
index bbd40b0..6385475 100644
--- a/OWNERS
+++ b/OWNERS
@@ -72,3 +72,4 @@
 
 reviewers:
 - krzysztof.grobelny@intel.com
+- nanzhoumails@gmail.com