Replace fzaninotto/faker with fakerphp/faker

[bjuppa]

This PR is replacing the dependency on deprecated fzaninotto/faker with the community maintained fakerphp/faker package.

See #2 for more details!

I haven't gotten the tests to run locally because of PHP versions, so I'm creating this PR in an attempt to trigger Travis builds.
I'm expecting to edit the Travis config along the way if tests doesn't pass.

[bjuppa]

Oh, I see Travis was not connected to automatically run on PRs.

Then I'd like to give more information how I've tested this change using my own project https://github.com/bjuppa/laravel-blog

In the composer.json you can see a temporary reference to the branch this PR will merge:
https://github.com/bjuppa/laravel-blog/blob/f6a102d63efb673d412ff59bc2060d5262fbdfb3/composer.json#L32-L40

So, the changes in this PR at least works with this Travis setup in my package, covering PHP 7.3, 7.4 and 8.0: https://github.com/bjuppa/laravel-blog/blob/master/.travis.yml

[vstyler96]

@andrefigueira are this changes acceptable to be merged?