Support Guzzle 6 as well

[drbyte]

After very rudimentary testing, this seems to be all that's necessary to accommodate Guzzle 6 and Laravel 5.4 and PHP 7.1

Fixes #2

[nicolas-t]

Thanks @drbyte for those (like me) looking for how to install this version (before it gets merged) : in composer.json :

    "require": {
        ...
        "appstract/laravel-opcache": "dev-master"
    }
    ...
    "repositories": [
        ...
        {
            "type": "git",
            "url": "git@github.com:drbyte/laravel-opcache.git"
        }
    ],

[ovanschie]

I was about to try this after the weekend, I suppose I can try it now as it already seems to work :)

[drbyte]

Oh cool. Thanks! That was speedy!

Will be grateful if you'll tag a new release after you're satisfied with it. ;)

[ovanschie]

Yes I was already busy doing that :P. Thanks for your contribution!

[drbyte]

👍 Cheers!