more readme updates
more readme updates

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