fix: remove netbsd keyword (#72)

Author: davidkna

Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Starship Contributors"]
 build = "build.rs"
 categories = ["os"]
 edition = "2021"
-keywords = ["battery", "linux", "macos", "windows", "freebsd", "netbsd"]
+keywords = ["battery", "linux", "macos", "windows", "freebsd"]
 license = "ISC"
 readme = "README.md"
 repository = "https://github.com/starship/rust-battery"