update CHANGES

added tests_polarizability, package now has 100% coverage

add unit tests for transition.py with 100% coverage

simplify StateRegistry type checking

add fix for default_units to fix bug in magic_wavelength

added attributes with default units to Transition, fixed magic_wavelength bug, added type teching to TransitionRegistry

add complete coverage for laser.py

add setter for Rabi_frequency

fix formatting

Merge pull request #3 from wipfli/patch-1

Merge branch 'main' into patch-1

replace handmade cache in wigner with functools.lru_cache

change getting-started to match change to Transition.__repr__

fix test_polarizability to be compatible with Python 3.10 floats

add unit tests providing full overage of nist and partial coverage of laser