Update providers list

[marcbelletre]

Hi Ricardo,

Thanks for this very useful package.

I made this PR just to update the providers list from oembed.com as it has been updated since last time it was copied into your package and it now contains a service I need to handle.

I think there could be a better way to handle this JSON file. Maybe the OEmbed class could take an array of providers as an argument?

$array = [
    [
        'provider_name' => '23HQ',
        'provider_url' => 'http://www.23hq.com',
        'endpoints' => [
            [
                'schemes' => [
                    'http://www.23hq.com/*/photo/*',
                ],
                'url' => 'http://www.23hq.com/23/oembed',
            ],
        ],
    ],
    ...
];

$service = new OEmbed($array);

This way users could just store their own array of supported providers in a separate config file instead of relying on the default ones.

I can work on a PR if you are interested in this.