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python/demos/demo_spectrogram.py: remove unused import

--- a/python/demos/demo_spectrogram.py

+++ b/python/demos/demo_spectrogram.py

@@ -2,7 +2,7 @@

 import sys, os.path

 from aubio import pvoc, source

-from numpy import array, arange, zeros, log10, vstack

+from numpy import zeros, log10, vstack

 import matplotlib.pyplot as plt

 def get_spectrogram(filename, samplerate = 0):