examples and API doco out of date

[abulka]

I installed 5.0.2 and the readme examples and API doco uses deprecated calls canLaunch and launch. E.g. the example

Future<void> _onOpen(LinkableElement link) async {
  if (await canLaunch(link.url)) {
    await launch(link.url);
  } else {
    throw 'Could not launch $link';
  }
}

should be something like:

Future<void> _onOpen(LinkableElement link) async {
  final Uri url = Uri.parse(link.url);
  if (await canLaunchUrl(url)) {
    await launchUrl(url);
  } else {
    throw 'Could not launch $link';
  }
}

This is pretty confusing for newcomers to this project.