PyGAD independent, package indexing improvements

This small release expands the robustness of the package. If you did not download PyGAD you do no longer need to adapt your code. Moreover metadata where changed so that the package will be most accurately classified on PyPi.

Added

• The example file examples/strider.py is now shipped with the Python package.
• leggedsnake/geneticoptimizer.py can now automatically switch to the built-in GA algorithm if PyGAD is not installed.

Changed

• setup.cfg metadata