Bug: Mouse handlers don't work for line chart and area chart

[ngocdaothanh]

Please see examples:

• https://rma-consulting.github.io/react-easy-chart/line-chart/index.html#mouseHandlers
• https://rma-consulting.github.io/react-easy-chart/area-chart/index.html#mouseHandlers

I want to use mouse handlers. If you don't have time, just tell me where to fix, I'll fix and create a PR.

[joelseq]

I'm having the same issue with the BarChart as well

EDIT:
Never mind it actually works now somehow. I don't really know what I changed but it seems to be working now.

[harunhasdal]

It seems this is a Firefox specific issue. In chrome it seems to work fine.

In Firefox, the data points don't seem to render. So it is not about the mouse handler but actually the dataPoints property not working. It is the data points (svg circles) that the mouse handlers are attached to.

@ngocdaothanh you're welcome to create a PR. Following place is a good place to start diagnosing the issue. https://github.com/rma-consulting/react-easy-chart/blob/master/modules/line-chart/index.js#L290