Release v2.1.0

[v2.1.0]

Added

• #49 Add support for Flightradar24 API
• Explicitly disable USB SD passthrough in settings.toml
• #51 Add Skyportal user agent to all API calls

Changed

• Bump supported CircuitPython to v10.3 only
• Bump vendored libraries to v10.3 compatible *.mpy files
• Bump vendored mpy-cross binaries to CircuitPython v10.3
• #47 Update OpenSky API for new authentication flow
• Migrate from settings.py to settings.toml for secrets management
• #50 Cache UTC offset during device initialization rather than querying AIO every time it's needed
• #53 (Internal) Update AWS Lambda proxy sample