'plotly_hover' event listener does not work on Pie charts.

[GauthamGoli]

[mdtusz]

Please read our contributing guide before opening issues. Bug reports must be accompanied with a reproducible example. We recommend using codepen, jsfiddle or jsbin to share your example.

That said, this is a feature that hasn't yet been implemented for pie charts, but will be added in the future.

[mdtusz]

#150