require sdk >= 3.6.0

Author: FZambia

pubspec.yaml

@@ -8,7 +8,7 @@ description: >
 homepage: https://github.com/centrifugal/centrifuge-dart
 
 environment:
-  sdk: '>=3.3.0 <4.0.0'
+  sdk: '>=3.6.0 <4.0.0'
 
 dependencies:
   fixnum: ^1.0.0