feat: Update plugin for NativeScript 4.0

[lini]

• bump versions of demo dependencies to target NativeScript 4
• remove plugin configuration from plugin's manifest and add it to demo
• update docs to reflect the breaking change to plugin configuration

[radeva]

Hi @jogboms, @mkloubert When do you expect to publish a version with this fix?

[jogboms]

@radeva. I already did 2 days ago