current_user_playing_track return 401

[luukvankooten]

Describe the bug
the method in the spotify client current_user_playing_track return Err( StatusCode(401, "Unauthorized", ),)

To Reproduce
Steps to reproduce the behavior:

1. Build oauth
2. Build spotify
3. Add or set the scope to user-read-currently-playing
4. prompt user for token.
5. call the method current_user_playing_track

Expected behavior
An struct of CurrentlyPlayingContext

Log/Output data

Err(
    StatusCode(
        401,
        "Unauthorized",
    ),
)

Additional context
To solve the problem in the method current_user_playing_track change self.get to self.endpoint_get

[luukvankooten]

I also created a pull request for this fix, see #209.