LISTEN with a "." character

Hi! Is it possible to listen to a channel which has a "." character in its name?

```js
const channel = "a.b";

await sql.listen(channel, (payload) => {
  console.log(payload);
});

await sql.notify(channel, "hello");
```

throws `Uncaught (in promise) PostgresError: syntax error at or near "."`

Is there a way to escape this character?
