Feature request: Support Jupyter notebooks and IPython

I think it can not support jupyter right now, but I hope it could be done lately.

NotImplementedError                       Traceback (most recent call last)
<ipython-input-6-48087d91d6cf> in <module>()
      5     return number
      6 
----> 7 number_to_bits(6)

<decorator-gen-164> in number_to_bits(number)

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\pysnooper.py in decorate(function, *args, **kwargs)
     70                     write=write, variables=variables,
     71                     depth=depth, prefix=prefix):
---> 72             return function(*args, **kwargs)
     73 
     74     return decorate

<ipython-input-6-48087d91d6cf> in number_to_bits(number)
      1 import pysnooper
      2 
----> 3 @pysnooper.snoop('file.log')
      4 def number_to_bits(number):
      5     return number

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\tracer.py in trace(self, frame, event, arg)
    180 
    181         now_string = datetime_module.datetime.now().time().isoformat()
--> 182         source_line = get_source_from_frame(frame)[frame.f_lineno - 1]
    183         self.write('{indent}{now_string} {event:9} '
    184                    '{frame.f_lineno:4} {source_line}'.format(**locals()))

C:\ProgramData\Anaconda3\lib\site-packages\pysnooper\tracer.py in get_source_from_frame(frame)
     73             pass
     74     if source is None:
---> 75         raise NotImplementedError
     76 
     77     # If we just read the source from a file, or if the loader did not

NotImplementedError: 

[cool-RR]

I implemented IPython support! Now just Jupyter support left.

[cool-RR]

Oh awesome, looks like that fixed Jupyter as well 😃

I made a separate task #43 to add testing for this feature. Any takers?