Update the experimental features hyperlink in the readme

[LegitGreenBoi]

When clicking the 'experimental features' hyperlink listed under 'Features' it links to the following dead page:
https://github.com/SpotX-CLI/SpotX-Win/discussions/50

I played around with the URL and got redirected to this link which seems to be the actual intended page:
SpotX-Official/SpotX#50

Seems like the linked repo name was changed and the link on this repo's readme never got updated.

EDIT: It looks like this repository is dead due to an official Bash release of SpotX.
Here's the official version, use this instead: https://github.com/SpotX-Official/SpotX-Bash