Update tests and classes

• Fix PHPUnit\Framework\TestCase class usage a486758

• Replace Carbon/Carbon with Illuminate\Support\Carbon 7f928d7

• Replace defunct GuzzleHttp\Message\ResponseInterface with Psr\Http\Message\ResponseInterface 13af230

Update TraktProvider to comply with league/oauth requirements

v3.0.1

Add missing abstract functions to TraktProvider class

Major update after initial fork

This is a major update after initial fork from megawubs/trakt-api wrapper.
Changes include:

• Add laravel auto-discovery (supported since laravel 5.5)

• Update library requirements

• PHP 7.2 is the minimum version supported