docs(html5ever): Add Cargo.toml keywords (#565)

Author: CosmicHorrorDev

html5ever/Cargo.toml

@@ -8,6 +8,7 @@ description = "High-performance browser-grade HTML5 parser"
 documentation = "https://docs.rs/html5ever"
 build = "build.rs"
 categories = [ "parser-implementations", "web-programming" ]
+keywords = ["html", "html5", "parser", "parsing"]
 edition = "2021"
 readme = "../README.md"