Refactor Repo Commits Compare method

[bobeagan]

The compare method in https://github.com/KnpLabs/php-github-api/blob/master/lib/Github/Api/Repository/Commits.php currently accepts a mediaType parameter to change the Accept header. It seems like this should have a configure() method that handles this, which would follow the pattern of how it is handled elsewhere in the library.

This would be a breaking-change and should be targeted for the next major release.

[acrobat]

I don't know actually if we should change this. I like the fact that the mediatype change is only for that specific method and doesn't change it for the whole object (and all api calls in it) like AcceptHeaderTrait and configure method would do.

So I'm more in favour of keeping it this way.

[bobeagan]

I'm not invested in this request enough to argue one way or the other for it. Will close.