AttributeError: type object 'Callable' has no attribute '_abc_registry'

Bug report

Step 1: Are you in the right place?

• I have verified there are no duplicate active or recent bugs, questions, or requests
• I have verified that I am using the latest version of GtkStressTesting (GST)

Step 2: Describe your environment

• GST version: 0.7.1
• Installed from source/Flatpak/other (specify): packaging from source
• Distribution name and version (e.g. Ubuntu 18.10): Solus 4.1
• Desktop Environment (e.g. Gnome 3.30): Budgie
• CPU (e.g. AMD Ryzen 7 3800X): Intel® Core™2 Duo CPU E4500 @ 2.20GHz × 2

Step 3: Describe the problem:

Steps to reproduce:

1. Packaged
2. Installed
3. Run on termianl

Observed Results:

Expected Results: Launch the app

Console logs:

Traceback (most recent call last):
  File "/usr/bin/gst", line 53, in <module>
    from gst import __main__
  File "/usr/lib/python3.7/site-packages/gst/__main__.py", line 25, in <module>
    from typing import Type
  File "/usr/lib/python3.7/site-packages/typing.py", line 1357, in <module>
    class Callable(extra=collections_abc.Callable, metaclass=CallableMeta):
  File "/usr/lib/python3.7/site-packages/typing.py", line 1005, in __new__
    self._abc_registry = extra._abc_registry
AttributeError: type object 'Callable' has no attribute '_abc_registry'