Fix issue with missing scipy package

[itsonlyjames]

Couldn't install the blender add-on due to this error message:

Traceback (most recent call last):
  File "/Applications/Blender.app/Contents/Resources/3.6/scripts/modules/addon_utils.py", line 333, in enable
    mod = __import__(module_name)
  File "Library/Application Support/Blender/3.6/scripts/addons/BlenderSpike/__init__.py", line 45, in <module>
    from .neuron_builder import NeuronBuilderProps, BLENDERSPIKE_OT_NeuronBuilder
  File "Library/Application Support/Blender/3.6/scripts/addons/BlenderSpike/neuron_builder.py", line 4, in <module>
    from .utils import linear_interpolation
  File "Library/Application Support/Blender/3.6/scripts/addons/BlenderSpike/utils.py", line 2, in <module>
    from scipy.interpolate import interp1d
ModuleNotFoundError: No module named 'scipy'

Requiring scipy in the init script fixed the issue for me.