Example should be renamed to include simpletest

[kattni]

Example motor_servo_sweep.py should be renamed to motor_servo_sweep_simpletest.py to fit with CircuitPython library standards.

[kattni]

Thanks for doing this! It's close! I've left comments on the PR.

[williamlai2]

I've redone it now. Hopefully this works better. I did the file rename in git. #33