update versioning to make a preview

Author: tmthecoder

pubspec.yaml

@@ -4,10 +4,10 @@ version: 1.1.3
 homepage: https://github.com/tmthecoder/dargon2
 
 environment:
-  sdk: '>=2.8.1 <3.0.0'
+  sdk: '>=2.12.0-259.9.beta <3.0.0'
 
 dependencies:
-  ffi: '>=0.1.3 <2.0.0'
+  ffi: '^1.0.0'
   convert: '>=2.1.1 <4.0.0'
   meta: '>=1.2.3 <2.0.0'