python3兼容性

[SuperFashi]

用python3的话会报错。

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/SAKS-SDK/sakshat.py", line 27, in <module>
    import entities
  File "/home/pi/SAKS-SDK/entities/__init__.py", line 1, in <module>
    from buzzer import Buzzer
ImportError: No module named 'buzzer'