0.3.0

Updated Swift Tools version to 6.0 (stil using language version 5).

Breaking Changes

• ARTCC: ICAO ID is now optional.

API Changes

• ISO-Latin1 encoding is used when parsing distribution text files.
• Moved from NSLocalizedString to string catalogs.
• Runway: Added a gradient estimation method that uses the base and reciprocal
  elevations (when known). You can use this is a stopgap until the FAA resumes
  distributing runway gradient data.
• Dependency updates.

0.2.0

Updated ZIPFoundation dependency.

Breaking Changes

• The ArchiveFileDistribution and ArchiveDataDistribution initializers no
  longer return nil if the archive could not be read; instead, they rethrow
  the error thrown by ZIPFoundation.
• The ArchiveFileDownloader and ArchiveDataDownloader's load methods no
  longer throw Error.badData; instead they rethrow the error thrown by
  ZIPFoundation.

0.1.0

Initial pre-release (Airport, ARTCC, FSS, and Navaid parsing).