update readme run agent with /usr/lib64 volume
appmesh cni plugin requires /usr/lib64 on some os like al2 to run iptables.
this binding is currently missing from readme file
@@ -63,10 +63,11 @@ $ /usr/bin/docker run --name ecs-agent \
--volume=/var/log/ecs/:/log:Z \
--volume=/var/lib/ecs/data:/data:Z \
--volume=/etc/ecs:/etc/ecs \
---volume=/lib:/lib \
--volume=/sbin:/sbin \
+--volume=/lib:/lib \
--volume=/lib64:/lib64 \
--volume=/usr/lib:/usr/lib \
+--volume=/usr/lib64:/usr/lib64 \
--volume=/proc:/host/proc \
--volume=/sys/fs/cgroup:/sys/fs/cgroup \
--net=host \
