PR: [8](https://github.com/alphagov/digitalmarketplace-apiclient/pull/8)
What changed
The `authenticate_user` method used to take a boolean flag to indicate if the user is a supplier user.
Now it just returns users with any role, and it is up to the front-end apps to decide if the authenticated
user should be allowed to access a resource.
Example app change
Old
python
user = api_client.authenticate_user("email_address", "password", supplier=False)
New
python
user = api_client.authenticate_user("email_address", "password")