Fix keywords field to conform to crates.io requirements

- https://doc.rust-lang.org/cargo/reference/manifest.html#the-keywords-field

Signed-off-by: Keshav Priyadarshi <[email protected]>

Author: keshav-space

Cargo.toml

@@ -10,14 +10,15 @@ readme = "README.md"
 documentation = "https://docs.rs/purl_validator"
 
 repository = "https://github.com/aboutcode-org/purl-validator.rs"
-keywords = ["package url", "package", "purl"]
+keywords = ["packageurl", "package", "purl", "sbom-tool"]
 categories = ["development-tools", "security" ]
 
 include = [
     "src/**",
     "purls.fst",
     "Cargo.toml",
     "README.md",
+    "CHANGELOG.md",
     "LICENSE"
 ]