Remove the existing feature from the list of 'to be'

Author: ArtyomVancyan

README.md

@@ -13,7 +13,6 @@ the [social-core](https://github.com/python-social-auth/social-core) authenticat
 
 - Use multiple OAuth2 providers at the same time
     * There need to be provided a way to configure the OAuth2 for multiple providers
-- Token -> user data, user data -> token easy conversion
 - Customizable OAuth2 routes
 - Registration support