Use pyqt5

[r00tdaemon]

Use pyqt5 for a simple reason that its wheels are available on pypi so users don't have to go through the pain of installing pyqt4 themselves.

[necrose99]

https://www.kdab.com/automated-porting-from-qt-4-to-qt-5/

Gentoo Linux , (https://www.youtube.com/watch?v=6l6vqPUM_FE) QT4 going going gone.... being distro droped

[zdenop]

PR #11 should this

[Geek-ubaid]

This issue is solved in #11