Continuous colormaps not working

[gioarma]

#548 should have closed this issue, but I still have problems. If I run the code in issue #327:

import numpy as np
import pandas as pd
import hvplot.pandas

cmap = 'cubehelix'

df = pd.DataFrame(np.random.randn(1000, 10), index=pd.date_range('1/1/2000', periods=1000))
df = df.cumsum()
df.hvplot(colormap=cmap)

I actually just get the default colormap, the colormap command is completely ignored:

Software versions:

hvplot 0.7.1 holoviews 1.14.3 bokeh 2.3.1 jupyterlab 3.0.14 Chrome 90.0.4430.93 macOS 10.15.7