✨ Handle GQL non-200 response

[ponty33]

close #148
doc

• Raise exception if the response is not 200, Shopify GQL should always return 200
• According to the doc all non-200 errors will return in this format

{
  "errors": "{Error message}"
}

[lishanl]

Thanks @ponty33 , it looks good. It would be great if you can add a test for it.

[hillairet]

@ponty33 Let's try to get this out of the way next week just to avoid stale PRs.

[ponty33]

@hillairet Actually it's ready for review, I don't know why it's not passing the tox

[hillairet]

Check the logs. That's for python 3.9:

Changed