v1.2.8 - Improve Dart SDK release readiness

Improvements

• Improved package metadata for pub.dev.

Fixes

• Removed an invalid public export for StatsigEnvironment
• Cleaned up analyzer warnings while preserving Dart 3.0 compatibility

Included In This Release

• 204a4c5 chungdaniel
  • Clean up Dart analyzer warnings (#58)
• 5a9cc72 chungdaniel
  • docs: prep CHANGELOG.md for automated release entries (#59)
• f3335b8 chungdaniel
  • ci: add publish to pub.dev workflow (#56)

Full Changelog: v1.2.7...v1.2.8