TypeError: must be str, not bytes

I get the following error message when I run most example scripts (Binaural.py for example):

Python36\lib\site-packages\wavebender\wave.py", line 470, in _write_header
    self._file.write(b'RIFF')
TypeError: must be str, not bytes

This is most likely a Python 3 issue, since handling bytes and str has been changed from Python 2 to Python 3.

