Catch additional prams in user details response

[imaimai86]

When the access token has more scope of access, the user details endpoint will return additional data than catch in the function userDetails.
Additional params includes following

• birthdate
• country
• followers
• product

Also we can use these details to check if the user has premium account.

Response of user details request when access token has more scopes including following

• user-read-private
• user-read-birthdate
• user-read-email

stdClass object {
birthdate => (string) 1984-03-23
country => (string) GB
display_name => null
email => (string) xxx@xxx.com
external_urls => stdClass object {
spotify => (string) https://open.spotify.com/user/xxx
}
followers => stdClass object {
href => null
total => (int) 0
}
href => (string) https://api.spotify.com/v1/users/xxx
id => (string) xxx
images => array(1) (
[0] => stdClass object {
height => null
url => (string) https://profile-images.scdn.co/images/userprofile/default/xxx
width => null
}
)
product => (string) premium
type => (string) user
uri => (string) spotify:user:xxx
}