chore: add spotify as a user to readme

[mclarke47]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed the CLA.
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@125a854). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #769   +/-   ##
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  Coverage          ?   82.66%           
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  Files             ?       95           
  Lines             ?     8071           
  Branches          ?        0           
=========================================
  Hits              ?     6672           
  Misses            ?      997           
  Partials          ?      402           

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