Open PR link goes to a 404

[danielphilipjohnson]

Provide a description of requested docs changes

Documentation Issue: "Open PR" link in README.md took me to github 404.

How I resolved it

• changed /github/ to /pull-requests

Will push a change shortly

Able to fix / change the documentation?

• [X] Yes
• [ ] No

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[danielphilipjohnson]

https://github.com/vuestorefront/shopify/pull/370/commits

Let me know if any changes are required 😄