Upgraded doctrine/orm to 2.7

[dlundgren]

• Dropped support for PHP < 7.2
• Also upgraded other dev dependencies

[dlundgren]

This would most likely constitute a jump to 2.0 of the library, especially considering how I dropped support for PHP < 7.2

[coveralls]

Coverage increased (+0.3%) to 98.024% when pulling 5435c4a on dlundgren:upgrade-doctrine-orm into 97b166f on webfactory:master.

[coveralls]

Coverage increased (+0.3%) to 98.024% when pulling 5435c4a on dlundgren:upgrade-doctrine-orm into 97b166f on webfactory:master.

[mpdude]

Wow, good job @dlundgren!

I guess I'll need a few days to review and test this. Probably I'll also try to switch to GitHub Actions, since it seems neither Scrutinizer nor Travis actually ran the tests.

Regarding a 2.0 major bump – I'd like to avoid that if possible, but I also don't see why this would be necessary? Raising dependency requirements IMHO does not constitute a major change, since users of this library won't need to change code on their side. Probably I'd say it should be a minor release, so we could still ship bugfixes for PHP <7.2 if needed.

[mpdude]

Why is it necessary to raise the doctrine/orm requirement to ^2.7?

You want to be able to use the compatibility layer from here to address Doctrine deprecations.