add devices[lastUsedMs] [close #210]
add devices[lastUsedMs] [close #210]

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