fix comment
fix comment

thebigmunch/gmusicapi,simon-weber/Unofficial-Google-Music-API,jimyx17/gmusic,tanhaiwang/gmusicapi,simon-weber/gmusicapi,dvirtz/gmusicapi,dvirtz/gmusicapi,TheOpenDevProject/gmusicapi,nvbn/Unofficial-Google-Music-API,peetahzee/Unofficial-Google-Music-API