release version 1.5.0 (Laravel 5.4 compatibility)

- fix: argument error with Laravel 5.4

release version 1.4.3

- fix: additional watermark parameters don't work

release version 1.4.2

- docs: update config.php example in readme.md

release version 1.4.1

- fix: constant defined without quotation marks

release version 1.4.0

- feat: add functionality for custom config

release version 1.3.0

- refactor: use separate PDF instances

release version 1.2.0

- feat: add watermark functionality
- feat: add method SetProtection

release version 1.1.4

- fix: old niklasravnsborg/mpdf is included

release version 1.1.3

- feat: use mpdf/mpdf

release version 1.1.2

- fix: PDF protection enabled