Incompatible with urllib3 `read(size, decode_content=True)

[pjrobertson]

urllib3 allows the kwargs decode_content=None and cache_content=False.

See: https://urllib3.readthedocs.io/en/stable/reference/urllib3.response.html#urllib3.response.BaseHTTPResponse.read

If trying to patch a library that uses something like:

myresponse.read(decode_content=True) then patching failes with:

Editing VCRHTTPResponse.read as follows fixes the issue:

    def read(self, *args, **kwargs):
        # urllib3 allows the kwarg 'decode_content' but BytesIO does not support it
        kwargs.pop("decode_content", None)
        return self._content.read(*args, **kwargs)

I'm not sure if this is the way to go though.