bug#36965: streamlink fails to run

[Josh Holland]

Hi,

If I try to run streamlink, each plugin it tries to import fails to load
with an error message similar to the following:

Failed to load plugin zhanqi:
  File 
"/gnu/store/h8l1pby3cm6b4fxsfwwr65b4d1hyh6cs-python-3.7.0/lib/python3.7/imp.py",
 line 235, in load_module
    return load_source(name, filename, file)
  File 
"/gnu/store/h8l1pby3cm6b4fxsfwwr65b4d1hyh6cs-python-3.7.0/lib/python3.7/imp.py",
 line 172, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 696, in _load
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 724, in exec_module
  File "<frozen importlib._bootstrap_external>", line 838, in get_code
TypeError: a bytes-like object is required, not 'str'

This smells like a Python 2 vs 3 problem to me, but I'm not sure how to
diagnose it.  I also tried upgrading the package to 1.1.1, but that
gives the same error.  I can attach a patch for the former if required,
but I'd rather get to the bottom of this error before making any changes.

--
Josh Holland