do not depend on dart prerelease (#257)

ened · web-flow · commit 82c10d0f8ca6 · 2021-04-18T18:36:00.000+01:00
diff --git a/pubspec.yaml b/pubspec.yaml
@@ -6,7 +6,7 @@ repository: https://github.com/fluttercommunity/flutter_workmanager
 issue_tracker: https://github.com/fluttercommunity/flutter_workmanager/issues
 
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
   flutter: ">=1.12.13+hotfix.5"
 
 dependencies:
