matchMock() now also matches GET = get (case insensitive)

[pkyeck]

I had the problem that one of my mocks was ignored and the actual request was sent out even though others were working.

Had my mock defined like this:

{
  url: '/',
  method: 'POST',
  ignoreQueryParams: true,
  status: 200,
  response: {
    message: 'ok',
  },
}

And was grabbing the method from a <form> element and passing to fetch() like so:

const formEl = module as HTMLFormElement;
const { action, method } = formEl;

// ...

const response = await fetch(action, {
  method,
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({}),
})

But the mock didn't work ... only after debugging for a while, I realized that the method I got from the HTMLFormElement was lowercase and the reason why the faker wasn't matching my mock with the fetch-request.

This change allows both versions: GET and get or POST and post.

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