chore: release v0.3.0 [skip ci]

Author: cxw620

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "proxy-protocol-codec"
-version = "0.2.2"
+version = "0.3.0"
 edition = "2021"
 rust-version = "1.83.0"