[flutter] v0.0.1

What's Changed

• [flutter] use com.nativebrik.sdk:0.0.6 by @RyosukeCla in #14
• [flutter] add license, update readme, update pubspec.yaml by @RyosukeCla in #15
• update by @RyosukeCla in #16

Full Changelog: android.v0.0.6...flutter.v0.0.1