The usage should reflect that `getResourceOwner` isn't necessarry to get the user_id and user_name

The `https://api.imgur.com/oauth2/token` endpoint already returns the `account_id` and `account_username` available via `$token->getValues()`.
If nothing more is needed the `$provider->getResourceOwner` call isn't necessary.

This should probably made more clear in the usage.

Start by finding the usage section for the Imgur OAuth2 provider and the example that calls $provider->getResourceOwner. The issue says the token endpoint already returns account_id and account_username via $token->getValues(); done means the usage text makes clear that getResourceOwner is not necessary when only those values are needed.

Written by the indexing model from the issue text.