Plot a band structure on symmetry line using BSPlotter()

def plot_bands(self):
        """
            Plot a band structure on symmetry line using BSPlotter()
        """
        if self.bzt_interp is None:
            raise BoltztrapError("BztInterpolator not present")

        sbs = self.bzt_interp.get_band_structure()

        return BSPlotter(sbs).get_plot()