Pyside2 support (continued..)

[rth]

Continuation of #161 by @fabioz aiming to add PySide2 support.

This PR,

• addresses review comments from Adding support for PySide2 in pytest-qt. #161
• adds CI setup
• removes the attempt to fix test_wait_signal.py::test_destroyed for PySide* as I have not managed to make this change pass CI (see test_wait_signal.py::test_destroyed and PySide #183).
• also change pytest to the verbose mode in CI so that in case of segfault in Appveyor, it's more evident which test caused it..

[coveralls]

Coverage remained the same at 100.0% when pulling b59932a on rth:pyside2-support into aa70124 on pytest-dev:master.

[coveralls]

Coverage remained the same at 100.0% when pulling d147bdc on rth:pyside2-support into aa70124 on pytest-dev:master.

[nicoddemus]

This looks great, thanks!

@The-Compiler would you like to take a look as well?

[The-Compiler]

Seems fine from a very quick look, though I've never used PySide2.

[nicoddemus]

OK, merging then. Thanks @rth!

I will make a new release later today or during the weekend!

[rth]

Thanks for the quick review @nicoddemus and @The-Compiler !

[nicoddemus]

@rth I usually announce releases on twitter and I would like to mention you if you don't mind. If you don't, what's your twitter username?

[rth]

@nicoddemus Sure, it's RomanYurchak. Thank you!

[nicoddemus]

Released! 👍

Thanks again @rth!