use intl any for compatibility

Author: doonfrs

pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
     sdk: flutter
   # Follows the intl version included in Flutter.
   # https://github.com/flutter/flutter/blob/84a1e904f44f9b0e9c4510138010edcc653163f8/packages/flutter_localizations/pubspec.yaml#L11
-  intl: ^0.20.1
+  intl: any
   rxdart: ^0.28.0
   collection: ^1.18.0