warning for installation of Exudyn removed

python/rational_linkages/ExudynAnalysis.py

 import numpy as np
 from typing import Union
 
-from .utils import is_package_installed
 from .RationalMechanism import RationalMechanism
 
 
-if not is_package_installed('exudyn'):
-    print("Warning: The Exudyn package is not installed, since it is not "
-          "a dependency. To use this functionality, please install it "
-          "manually from PyPI using 'pip install exudyn'.")
-
-
 class ExudynAnalysis:
     """
     Class for dynamics analysis using Exudyn package.