Readme rollup-plugin-url mention

[mcshaz]

On windows filesystems, this plugin only finds the .map file pointed to with the //# sourceMappingURL= directive if the rollup-plugin-url plugin is added. This would also be great to have in the readme.

Thanks for your plugin!

[maxdavidson]

Thank you for pointing out it doesn't work in Windows. I don't think recommending @rollup/plugin-url is the right approach, since that's more of hack and I'd rather fix the path resolution here instead. I created #116 to track this issue

[mcshaz]

That was actually the direction I was going in my fork of this repo, but wasn't actually sure if/when this issue would be seen. Thanks - I'll post further thoughts in #116