[Docs] The Slack invitation link has expired

[kattakaha]

Summary

It seems that the Slack invitation link mentioned in the README has expired and is no longer usable. I would appreciate it if you could check this.

Link

nba_api/README.md

Line 76 in 4375b0e

Join [Slack](https://join.slack.com/t/nbaapi/shared_invite/zt-2c18itntt-ObWh0ovNQmnwLGFagmCbpg) to get help, help others, provide feedback, see amazing projects, participates in discussions, and collaborate with others from around the world.

Screenshot

[JohnMikko27]

Hi, can I work on this? I'm pretty new here and would like to contribute.

[kattakaha]

@JohnMikko27 Hi. That sounds good. If you can do it, please go ahead. However, I anticipate that you will not be able to issue an invitation link unless you are the owner of the Slack workspace or have the necessary permissions.

[rsforbes]

@JohnMikko27 - Thanks for the work here.