v2.0.0-dev.26

• Please refer to https://fzyzcjy.github.io/flutter_rust_bridge/guides/miscellaneous/whats-new for what's changed in V2.
• Allow specifying pubspec.yaml location in build.rs #1797 (thanks @HalidOdat)
• Hint how to only run build.rs if api directory changes #1794 (thanks @HalidOdat)