Writing logs to a file instead of console
I have a small express application that writes logs to a file.

In morgan, I'm doing the following:
```JAVASCRIPT
// ...
app.use(
  morgan('combined', {
    stream: fs.createWriteStream('./my_file.log', {
      flags: 'a',
    }),
  })
);
```

However, this won't work if I switch to cabin: (Still logs to console but no changes to file)

```JAVASCRIPT
const Cabin = require('cabin');
const cabin= new Cabin({
    stream: fs.createWriteStream('./test.log', {
      flags: 'a',
    }),
  });
// ...
app.use(cabin.middleware);
```