Scopes issue

[jeop10]

Hello!

First let me just say thank you for creating this amazing library, now I have been testing some things and I needed to set de 'save' scope and I went on and did this:

$reddit = new Reddit([
   . . .
    'scopes'        => ['identity', 'read', 'save'],
]);

But this does not add the save scope, I went on and looking to the code I can see that the variable its not call scopes but scope and you need to add it when you are calling the method to get the authorizationURL, like this:

$reddit->client->getAuthorizationUrl([
            'duration' => 'permanent',  // "permanent" or "temporary" by default
            'scope'        => ['identity', 'read', 'save'],
        ]); 

Did I make something wrong? Is this the intended behaviour? Should I make a merge request to update the documentation or maybe Should I try to fix it on the code itself so the code works just like explained on the docs?

Thanks again