4.0.0

Merged

• Support for Guzzle7/Laravel 8 #94

Commits

• Remove checks for unsupported PHP versions (5.6, 7.0 and 7.1) 03b54a7
• Add extra to composer.json for Laravel 8 support 8b6b52d
• Add php 7.4 checks 5882f18
• Add laravel 7 and 8 CI checks 2a349b0
• guzzle7 136ce58