Update link for sparse-registry

Author: wcampbell0x2a

README.md

@@ -9,7 +9,7 @@ zerus
 Lightweight binary to download only project required crates for offline crates.io mirror
 
 ## Requirements
-The example use case is with nightly feature [sparse-registry](https://blog.rust-lang.org/2022/06/22/sparse-registry-testing.html).
+The example use case is with nightly feature [sparse-registry](https://blog.rust-lang.org/inside-rust/2023/01/30/cargo-sparse-protocol.html).
 However, a crates.io-index mirror git repo can be hosted on its on and point towards this repo with stable rust.
 
 ## Build zerus