fix(Cargo.toml): expected at most 5 keywords per crate

Author: cxw620

Cargo.toml

@@ -8,7 +8,7 @@ rust-version = "1.77.0"
 authors = ["Hantong Chen <cxwdyx620@gmail.com>", "Miguel D. Salcedo <miguel@salcedo.cc>"]
 categories = ["network-programming"]
 description = "PROXY Protocol codec implementation in Rust. See HAProxy for the protocol specification."
-keywords = ["proxy", "protocol", "haproxy", "codec", "decode", "encode"]
+keywords = ["proxy", "protocol", "haproxy", "codec"]
 license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/hanyu-dev/proxy-protocol-codec"