Updated README (Spotify URI Section)

[MomoMiles]

Changed subdomain from home to music. added /api/ to the end of the domain to signify that you are connecting to an API

[glensc]

@Yooooomi: LGTM

the /api prefix is important, at least when using linux-server image:

• https://docs.linuxserver.io/images/docker-your_spotify/

[Yooooomi]

Taken into account, will be available next release. Thanks!

[glensc]

please share commits as well that implemented these changes