RestrictionRange not working as intended

[JCoetzee123]

Title

spira.core.parameters.restrictions not working as intended

Steps to reproduce:

1. Import required parts of the SPiRA framework

import spira.all as spira

2. Create a class excepting a spira.ParameterInitializer parameter and a range restriction

class Layer(spira.ParameterInitializer):
    range_int = spira.IntegerParameter(restriction=spira.RestrictRange(lower=1, upper=5))

3. Initialize Layer class in main script and assign invalid value

layer = Layer()
layer.range_int  = 11

Expected behavior (correct)

Error: ValueError, 11 not in range of 5

Current behavior (incorrect)

[SPiRA] Version 0.1.1-Auron [Beta] - MIT License

Possible fixes

Changes made to variables.py to correct logic error.