fix: fix typo in readme

[wztech0192]

fix typo in readme: publirshing -> publishing

Testing Instructions

Checklist

• [x] Update documentation as needed. Website Documentation PR:

• [x] Prefix PR title with [WIP] if necessary.

• [ ] Add tests to cover changes as needed.

• [ ] Test changes on the staging environment with Matcha API Staging.

  • [ ] SRA/Limit orders
  • [ ] Swap endpoints
  • [ ] Meta transaction endpoints
  • [ ] Depth charts

  For more information see 0x API Matcha smoke test runbook in Quip.