cms: add 'p7b' keyword in Cargo.toml

Author: tarcieri

cms/Cargo.toml

@@ -9,7 +9,7 @@ license = "Apache-2.0 OR MIT"
 homepage = "https://github.com/RustCrypto/formats/tree/master/cms"
 repository = "https://github.com/RustCrypto/formats"
 categories = ["cryptography", "encoding", "no-std", "parser-implementations"]
-keywords = ["crypto", "pkcs7", "signing"]
+keywords = ["crypto", "p7b", "pkcs7", "signing"]
 readme = "README.md"
 edition = "2021"
 rust-version = "1.81"