docs: update README WebdriverIO peer version reqs

[zachlysobey]

This PR should resolve issue #1635 (Clarification on required webdriverio version)

Just a one-liner change to the README in this repo.

-NOTE: [WebdriverIO](https://github.com/webdriverio/webdriverio) `v8.0.0` or higher is required!
+NOTE: [WebdriverIO](https://github.com/webdriverio/webdriverio) `v9.0.0-alpha.350` or higher is required!

This should now match what's in the package.json

  "peerDependencies": {
    "@wdio/globals": "^9.0.0-alpha.350",
    "@wdio/logger": "^9.0.0-alpha.350",
    "webdriverio": "^9.0.0-alpha.350"
  },

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: zachlysobey / name: Zachary Lysobey (8cec46f)
• ✅ login: christian-bromann / name: Christian Bromann (bb191cc)

[christian-bromann]

Thanks a lot 👍

[wdio-bot]

Hey zachlysobey 👋

Thank you for your contribution to WebdriverIO! Your pull request has been marked as an "Expensable" contribution. We've sent you an email with further instructions on how to claim your expenses from our development fund. Please make sure to check your spam folder as well. If you have any questions, feel free to reach out to us at expense@webdriver.io or in the contributing channel on Discord.

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The WebdriverIO Team 🤖