v 0.20.1

Added back wc (deprecated) so as not to break existing scripts.

Commits

• 9cf18fe: changed some refs from wc to rc (David Doty) #314
• 5ec6b80: Update scadnano.py (David Doty) #314
• 85f153c: Update scadnano.py (David Doty) #314
• 5327c48: Update scadnano.py (David Doty) #314
• bd8df31: Update scadnano.py (David Doty) #314
• c2f87e6: minor (Dave Doty) #314
• 314e848: Update scadnano.py (David Doty) #314
• 05acbbf: added back wc (deprecated) and bumped version (David Doty) #314
• 4eba568: Update run_unit_tests.yml (David Doty) #314