Does not run with Python 3.4.3

[gaul]

Would be nice to make this compatible or document the required Python version in the README:

$ python3 whoishiring.py 15601729
Traceback (most recent call last):
  File "whoishiring.py", line 15, in <module>
    hn_json = json.load(hn_response)
  File "/usr/lib/python3.4/json/__init__.py", line 268, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "/usr/lib/python3.4/json/__init__.py", line 312, in loads
    s.__class__.__name__))
TypeError: the JSON object must be str, not 'bytes'

Tested on Ubuntu 14.04.