Fix error on rhythmic_patterns_analysis_GUI.py

[jimearruti]

Ran python rhythmic_patterns_analysis_GUI.py data/candombe/csic.1995_ansina1_01.wav data/candombe/csic.1995_ansina1_01.csv

There are many deprecation warnings, but also an error when trying to play the file:
Traceback (most recent call last):
File "/home/jime/Workplace/eum/carat/myenv/lib/python3.8/site-packages/matplotlib/cbook/init.py", line 270, in process
func(*args, **kwargs)
File "/home/jime/Workplace/eum/carat/myenv/lib/python3.8/site-packages/matplotlib/widgets.py", line 225, in
return self._observers.connect('clicked', lambda event: func(event))
File "rhythmic_patterns_analysis_GUI.py", line 101, in playback
self.audio.play(self.lastind)
File "rhythmic_patterns_analysis_GUI.py", line 49, in play
bar_segment = carat.util.beat2signal(self.samples,
File "/home/jime/Workplace/eum/carat/carat/util.py", line 301, in beat2signal
raise ValueError('Index out of bounds.'
ValueError: Index out of bounds. ind_beat=-1, beats.size=139