returnTo seems to be the proper param

Author: tylerzey

01-Login/src/Auth/Auth.js

@@ -85,7 +85,7 @@ export default class Auth {
     localStorage.removeItem('isLoggedIn');
 
     this.auth0.logout({
-      return_to: window.location.origin
+      returnTo: window.location.origin
     });
 
     // navigate to the home route