Fix bad keyword.

Author: thejpster

Cargo.toml

@@ -3,7 +3,7 @@ name = "pc-keyboard"
 version = "0.7.0"
 authors = ["Jonathan 'theJPster' Pallant <[email protected]>", "Rust Embedded Community Contributors"]
 description = "PS/2 keyboard interface library."
-keywords = ["keyboard", "ps/2", "scancode", "layout"]
+keywords = ["keyboard", "ps2", "scancode", "layout"]
 categories = ["embedded", "no-std"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-embedded-community/pc-keyboard.git"