DotWidget class qt5 support fix in function wheelEvent #22
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event.delta() function is deprecated in qt5, now event.angleDelta().y() needs to be used.
We keep backwards compatibility for qt4.
check: https://stackoverflow.com/questions/48379373/attributeerror-qwheelevent-object-has-no-attribute-delta
"Qt4 had a delta attribute in the class QWheelEvent but now in Qt5 this has been replaced by two different properties angleDelta and pixelDelta"