Merge pull request #9 from g0dzillaa/master

Update to dart 2.19.4 and support for Dart 3

Author: gonuit

pubspec.yaml

@@ -1,6 +1,6 @@
 name: rps
 description: Define and run scripts from pubspec.yaml.
-version: 0.6.4
+version: 0.6.5
 repository: https://github.com/gonuit/rps
 homepage: https://github.com/gonuit/rps
 issue_tracker: https://github.com/gonuit/rps/issues
@@ -23,7 +23,7 @@ scripts:
 
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.19.4 <4.0.0"
 
 dependencies:
   yaml: ^3.1.0