Add astrachan to OWNERS file

Test: n/a
Change-Id: I673e329c6be9c71aeb5e9bce55bf88cd5613b42e
diff --git a/OWNERS b/OWNERS
index 5c0d0bd..62ded25 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,3 +1,4 @@
+astrachan@google.com
 ghartman@google.com
 jemoreira@google.com
 haining@google.com