Changing PIL import to fix Image error

[diegojuan]

apt.py is showing this error

jd@Juans-MacBook-Pro apt-decoder % python3 apt.py rs.wav rs1.pmng
Traceback (most recent call last):
 File "apt.py", line 100, in <module>
   apt.decode(outfile)
 File "apt.py", line 32, in decode
   image = PIL.Image.fromarray(matrix)
 File "/Library/Python/3.7/site-packages/PIL/__init__.py", line 42, in __getattr__
   raise AttributeError("module '{}' has no attribute '{}'".format(__name__, name))
AttributeError: module 'PIL' has no attribute 'Image'

To fix this, is recommended to import Image

import PIL.Image

This fix the error and the image can be properly generated

[zacstewart]

@diegojuan I believe you will also need to touch line 31 to use Image instead of PIL.Image