Improved locale format handling to match RFC 5646

• Updated README with instructions on how to migrate locale identifiers
• Added tests for locale validation
• Removed obsolete Swift 4 code (library has Swift 5 as minimum version)

Locale fallbacks

• Fall back to language code when localization file matching both language code and country code can not be found (for example en_US would fall back to en if en_US doesn't exist)
• Fall back to language code in pluralization rules lookup

Fixed Swift 4 warning

3.0.5

Added Brazilian Portuguese support

3.0.4

Swift 4 support

This release includes support for Swift 4 while preserving backwards compatibility with Swift 3.

Improved Linux support

• Fixed a crash when accessing Locale.availableIdentifiers for Swift 3.1 on Linux.

Improved error handling and API

• Added more checks and errors in all parsing code
• Improved documentation
• Added native Vapor provider support

API improvements and custom localizations data source

• Simplified and unified public API
• Added a possibility for loading localizations from a database or any custom written data source
• Improved documentation

Initial release

1.0.0