Added _finalize_artist method to mpl ElementPlot
Added _finalize_artist method to mpl ElementPlot

ioam/holoviews,basnijholt/holoviews,mjabri/holoviews,vascotenner/holoviews,basnijholt/holoviews,mjabri/holoviews,ioam/holoviews,vascotenner/holoviews,ioam/holoviews,basnijholt/holoviews,vascotenner/holoviews,mjabri/holoviews