fix readme

Author: tiamo

README.md

@@ -21,7 +21,7 @@ Inspired by [Cuberto - Animated Onboarding Screens](https://dribbble.com/shots/6
 * Add this to your pubspec.yaml
   ```
   dependencies:
-  concentric_transition: ^0.1.1
+  concentric_transition: ^1.0.0
   ```
 * Get the package from Pub:
   ```