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Update pubsub.md

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developer/tutorials/pubsub.md
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NATS is a publish subscribe messaging system. Subscribers listening on a subject receive messages on that subject. If the subscriber is not actively listening on the subject, the message is not received. Subscribers can use the wildcard tokens such as `*` and `>` to match a single token or to match the tail of a subject.
<div class="graphviz"><code data-viz="dot">
digraph nats_pub_sub {
graph [splines=ortho, nodesep=1];
sub1 [shape="box", label="SUB\ncom.msg.one"];
pub1 [shape="box", label="PUB\ncom.msg.one"];
non_active [shape="box", label="Non-Active\nSubscriber"];
{
rank=same
pub1 sub1 non_active
}
natsserver [shape="box", label="NATS", width=8];
sub2 [shape="box", label="SUB\ncom.msg.one"];
sub3 [shape="box", label="SUB\ncom.msg.two"];
sub4 [shape="box", label="SUB\ncom.msg.*"];
{
rank=same
sub2 sub3 sub4
}
pub1 -> natsserver [penwidth=2];
natsserver -> sub1 [penwidth=2];
natsserver -> non_active [style=dashed color=red arrowhead="none"];
natsserver -> sub2 [penwidth=2];
natsserver -> sub3 [style=dashed color=red arrowhead="none"];
natsserver -> sub4 [penwidth=2];
}
</code></div>
![pub/sub](/assets/images/pubsubtut.svg)
## Prerequisites