Upgrade test suite

[Th3Mouk]

Issue summary

Currently tests don't passed in PHP 7.2 for RowTests.php. PHP 7.3 is now in beta so we must include it too.

If Scrutinizer don't provide the feature, we might consider taking the tests under Travis CI.

Issue checklist

• Add PHP 7.2 tests
• Add PHP 7.3 tests

[tbolier]

I will look into this in the coming days.

Thanks for reporting!

[tbolier]

I have assigned this issue to milestone 2.1

However 7.2 will be supported ASAP

[tbolier]

I have test 7.2.9 and it worked fine without issues.