Update Docs: "ClientException with SocketException: Failed host lookup"; Android requires specific configurations to work

[KingRial]

Just wanted to let you know that flutter, on Android, has still this problem: dart-lang/http#877

It means that, whenever you are using an external browser to manage the authentication process and the App (using this package) goes in background and the authentication process fails with error:
ClientException with SocketException: Failed host lookup: 'xxx.yyy.zzz' (OS Error: No address associated with hostname, errno = 7)

The only way, I discovered, to solve the situation is:

• Using LaunchMode.inAppWebView (please be aware webview don't support self signed certificates!)

urlLauncher(String url) async {
    var uri = Uri.parse(url);
    await launchUrl(uri, 
        mode: LaunchMode.inAppWebView,
      );
  }

• Configuring the Android manifest to use clear text traffic (see: ERR_CLEARTEXT_NOT_PERMITTED Android #16)

It could be usefull to add these informations on the docs