Fix game's pubspec.yaml

examples/game/pubspec.yaml

@@ -2,12 +2,12 @@ name: asteroids
 dependencies:
   flutter: ">=0.0.3 <0.1.0"
   sky_tools: any
-  skysprites: any
+  flutter_sprites: any
   box2d: any
 dependency_overrides:
   material_design_icons:
     path: ../../sky/packages/material_design_icons
   flutter:
     path: ../../sky/packages/sky
-  skysprites:
+  flutter_sprites:
     path: ../../skysprites