Trying tutorial on Android Studio with actual versions

[tbecker]

The pubspec.yaml was changed to this versions to work:
name: hello_dart
version: 0.3.3
description: A visual and playful introduction to programming with the Dart language.
homepage: https://code.makery.ch/library/hello-dart/
documentation: https://github.com/marcojakob/hello-dart
environment:
sdk: '>=2.0.0 <3.0.0'
dependencies:
collection: ^1.14.12
stagexl: ^2.0.0
string_scanner: ^1.0.5
meta: ^1.6.0

dev_dependencies:
build_runner: ^1.9.0

stagexl needed to be updated, as some analyzer and meta version clashed. meta is now at 1.7.2 for me, which seems to work