chore(authenticator): Update versions on the README (#1854)

Author: salihgueler

packages/amplify_authenticator/README.md

@@ -12,9 +12,9 @@ To get started, add the Authenticator to a project which has the [Auth category]
 
 ```yaml
 dependencies:
-  amplify_auth_cognito: ^0.5.0
-  amplify_authenticator: ^0.1.0
-  amplify_flutter: ^0.5.0
+  amplify_auth_cognito: ^0.6.0
+  amplify_authenticator: ^0.2.0
+  amplify_flutter: ^0.6.0
 ```
 
 Then, wrap your app's logged in component with an `Authenticator` widget, and you're good to go. You can use the `SignOutButton` to sign out the user from anywhere in your app.