Can't use in Pubspec.yaml

[Big-taff]

Hi

I'm getting this error but the stable channel for dart is 2.10.4, any ideas?

The current Dart SDK version is 2.10.4.

Because healtheconomicsapp depends on animated_fab from git which requires SDK version >=2.12.0-0 <3.0.0, version solving failed.
pub get failed (1; Because healtheconomicsapp depends on animated_fab from git which requires SDK version >=2.12.0-0 <3.0.0, version solving failed.)

Pubspec looks like this:

dependencies:
flutter:
sdk: flutter

animated_fab:
git:
url: https://github.com/simrat39/animated_fab

flutter_localizations:
sdk: flutter

The following adds the Cupertino Icons font to your application.

Use with the CupertinoIcons class for iOS style icons.

cupertino_icons: ^0.1.2
cloud_firestore: 0.13.3
firebase_auth: ^0.15.5+2
provider: ^4.0.4
shared_preferences: ^0.5.12+4
flutter_platform_widgets: ^0.32.4
styled_text: ^1.0.2+1