2021.0.0

• ⬆️ Support Unity 2021
• ✨ Add new instance config options matchWebGLToCanvasSize and devicePixelRatio
• 📜 Update and improve readme documentation
• 🏠 Updated underlying type dependencies and tooling to new versions
• 🏠 Removed React 16 enyzme tests and replaced them with @testing-library
• 🐛 Fix missing instance config variables for memoryMap and symbolsUrl