Pyspectral incompatible with h5py=3.1.0

[adybbroe]

Code Sample, a minimal, complete, and verifiable piece of code

# Your code here
>>> from pyspectral.rsr_reader import RelativeSpectralResponse
>>> rsr = RelativeSpectralResponse('NOAA-20', 'viirs')

Problem description

The code fails for latest versions of h5py (3.1.0 released Nov 6, 2020), see below!

Expected Output

Code should run without exceptions and return the RSR data for N20/VIIRS

Actual Result, Traceback if applicable

rsr data may not be up to date: /data/proj/safutv/.local/share/pyspectral/rsr_viirs_NOAA-20.h5
4494378it [00:02, 1923809.28it/s]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/san1/opt/viirs_imagery_processor/releases/viirs_imagery_processor-0.2.65/lib/python3.8/site-packages/pyspectral/rsr_reader.py", line 125, in __init__
    self.load()
  File "/san1/opt/viirs_imagery_processor/releases/viirs_imagery_processor-0.2.65/lib/python3.8/site-packages/pyspectral/rsr_reader.py", line 174, in load
    self.description = self.description.decode('utf-8')
AttributeError: 'str' object has no attribute 'decode'

Versions of Python, package at hand and relevant dependencies

h5py=3.1.0
pyspectral=0.10.1 and latest master as of Nov 10, 2020

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