Release v0.2.0

📦 Release v0.2.0
♻️ Extend http-request example
📝 Describe HTTP permissions
📝 Update README for WASI & HTTP capability
♻️ Run modules in a new tokio thread
✨ Add wasi-experimental-http extension
✨ Add AssemblyScript example
✨ Add tinygo example
✨ Support WASI modules
✨ Add text2qr example
📝 Reword ferris demo README