1.7.0

This PolySharp release includes one more polyfill, and some improvements.

🪄 Polyfills

• [ModuleInitializer] (needed to enable custom module initializers)

✅ Bug fixes

• Tweaked the [CompilerFeatureRequired] polyfill to build correctly when using C# 8.0
• Disabled polyfill generation when C# < 8.0 to avoid causing build errors
• Added a new analyzer to emit warnings in this case to explain why polyfills are missing