0.5.0

• Rewrote core logic (again) to use libraries that support async
  • Replaced watchgod with watchfiles
  • Replaced web servers (websockets & python's socketserver) with starlette & uvicorn
• Renamed --blacklist CLI flag to --ignore
• Added new --debug CLI flag to toggle verbose logging
• Added a proper unit test suite
• Miscellaneous bug fixes and general improvements