Merge pull request #57 from TatsuUkraine/release-4.0.1

Release 4.0.1 -> master

Author: TatsuUkraine

pubspec.yaml

@@ -11,7 +11,7 @@ repository: https://github.com/TatsuUkraine/flutter_sticky_infinite_list
 issue_tracker: https://github.com/TatsuUkraine/flutter_sticky_infinite_list/issues
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter: