Remove the link to Zig SDK. (#43)

Signed-off-by: Takeshi Yoneda <[email protected]>

Author: mathetake

README.md

@@ -18,13 +18,11 @@ Proxy-Wasm extensions across different proxies.
 * [C++ SDK]
 * [Go (TinyGo) SDK]
 * [Rust SDK]
-* [Zig SDK]
 
 [AssemblyScript SDK]: https://github.com/solo-io/proxy-runtime
 [C++ SDK]: https://github.com/proxy-wasm/proxy-wasm-cpp-sdk
 [Go (TinyGo) SDK]: https://github.com/tetratelabs/proxy-wasm-go-sdk
 [Rust SDK]: https://github.com/proxy-wasm/proxy-wasm-rust-sdk
-[Zig SDK]: https://github.com/mathetake/proxy-wasm-zig-sdk
 
 ### Host environments