Add support of K8S 1.18

Change-Id: Idbde968ad1175f6a166570c9ab098d49d6a324cb
diff --git a/resources/simpleovs b/resources/simpleovs
index f43b8a1..df0d975 100755
--- a/resources/simpleovs
+++ b/resources/simpleovs
@@ -60,9 +60,9 @@
 case $CNI_COMMAND in
 ADD)
 	res=$(ipam)
-	ip=$(echo $res | jq -r '.ip4.ip')
+	ip=$(echo $res | jq -r '.ips[0].address')
 	add_br_and_port $ip
-        echo '{"cniVersion":"0.2.0"}' | jq -c --arg ip $ip '.ip4.ip = $ip' >&3
+        echo '{"cniVersion":"0.3.1"}' | jq -c --arg ip $ip '.ips[0].address = $ip' >&3
 	;;
 DEL)
 	set +o errexit