Problem with naming in Python 3.9

[ekisiel97]

Using Python 3.9, the following error will appear

File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner self.run()
File "/home/user/.local/lib/python3.9/site-packages/spotify_ripper/eventloop.py", line 78, in run
while self._runnable and self._ripper.isAlive():
AttributeError: "Ripper" object has no attribute "isAlive"

This is due to the fact that the inheritance of the Thread class from the threading has renamed the attribute isAlive() to is_alive().

This is easily fixed by changing the three files main.py, eventloop.py and ripper.py which each have exactly one instance of the isAlive attribute being referenced. This took me a while to find so hopefully for those who run into this in the future encounter this problem can fix it from this.

[tmaier]

Hi, can you provide a pull request?