Fixed imports in plotting/pandas.py
Fixed imports in plotting/pandas.py

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