[QGIS-Developer] How has QgsRubberBand changed in QGIS 3?

[C Hamilton]

In my plugin I have the following line:

self.crossRb = QgsRubberBand(self.canvas, QGis.Line)

QGis seems to have been removed from qgis.core. What needs to be done
differently for QGIS 3?

I'm error by error trying to migrate Lat Lon Tools to QGIS 3.

Thanks!!!
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