Cannot create plotly histogram from datetime data

[MarcSkovMadsen]

hvplot==0.8.2

Motivated by #998 I'm trying to improve the hist reference guide.

When I try to create a hist plot from a datetime column it works fine as long as I use the matplotlib or bokeh backends. When I start using the plotly backend it raises an exception.

import pandas as pd
from bokeh.sampledata.commits import data
import hvplot.pandas
backend = "plotly"
hvplot.extension(backend)

data=data.reset_index().sort_values("datetime")
plot = data.hvplot.hist(
    "datetime",
    bin_range=(pd.Timestamp('2012-11-30'), pd.Timestamp('2017-05-01')),
    bins=54, 
)

import holoviews as hv
hv.render(plot, backend)

$ python script.py
Traceback (most recent call last):
  File "C:\repos\private\tmp\holoviews\script.py", line 15, in <module>
    hv.render(plot, backend)
  File "C:\repos\private\tmp\holoviews\holoviews\util\__init__.py", line 829, in render
    return renderer_obj.get_plot_state(obj)
  File "C:\repos\private\tmp\holoviews\holoviews\plotting\plotly\renderer.py", line 86, in get_plot_state
    fig_dict = go.Figure(fig_dict).to_dict()
  File "C:\repos\private\hvplot\.venv\lib\site-packages\plotly\graph_objs\_figure.py", line 616, in __init__
    super(Figure, self).__init__(data, layout, frames, skip_invalid, **kwargs)
  File "C:\repos\private\hvplot\.venv\lib\site-packages\plotly\basedatatypes.py", line 514, in __init__
    data = self._data_validator.validate_coerce(
  File "C:\repos\private\hvplot\.venv\lib\site-packages\_plotly_utils\basevalidators.py", line 2668, in validate_coerce
    trace = self.get_trace_class(trace_type)(
  File "C:\repos\private\hvplot\.venv\lib\site-packages\plotly\graph_objs\_bar.py", line 3199, in __init__
    self["width"] = _v
  File "C:\repos\private\hvplot\.venv\lib\site-packages\plotly\basedatatypes.py", line 4859, in __setitem__
    self._set_prop(prop, value)
  File "C:\repos\private\hvplot\.venv\lib\site-packages\plotly\basedatatypes.py", line 5198, in _set_prop
    val = validator.validate_coerce(val)
  File "C:\repos\private\hvplot\.venv\lib\site-packages\_plotly_utils\basevalidators.py", line 803, in validate_coerce
    if not (self.min_val <= v <= self.max_val):
TypeError: The DType <class 'numpy.dtype[timedelta64]'> could not be promoted by <class 'numpy.dtype[float64]'>. This means that no common DType exists for the given inputs. For example they cannot be stored 
in a single array unless the dtype is `object`. The full list of DTypes is: (<class 'numpy.dtype[timedelta64]'>, <class 'numpy.dtype[float64]'>)