SimpleAlbum with SimpleArtists (#58)
SimpleAlbum with SimpleArtists (#58)

* Added a slice of SimpleArtists to SimpleAlbum

- Added a slice of SimpleArtists to the SimpleAlbum struct

* Fixed a typo in a comment

* Fixed a comment

- Since “array” is misleading in Go, I changed an occurrence of the word into slice instead

zmb3/spotify