[prettier-plugin-sh] Doesn't respect `prettier-ignore`

From https://prettier.io/docs/en/ignore.html :
> Use “prettier-ignore” comments to ignore parts of files.

So, I expected a comment like this

```sh
#!/usr/bin/env bash

# prettier-ignore
die() { echo "$*" 1>&2 ; exit 1; }

# .. rest of script
```

to cause the `die` function to not be formatted, but, it still does get formatted.