PATCH /repos/{owner}/{repo}/hooks/{hook_id}/config endpoint with url parameter #425

Follow up to github/docs#9900.

Right now, the following code

await octokit.request('PATCH /repos/{owner}/{repo}/hooks/{hook_id}/config', {
  owner: 'octocat',
  repo: 'hello-world',
  hook_id: 42,
  url: 'url'
})

Sends a PATCH request to /url', because the url parameter overwrites /repos/{owner}/{repo}/hooks/{hook_id}/config from the route option.

I think we should change that behavior. If a route parameter is set, then parameters.url should be passed as query or request body parameter, depending on the method.