Remove keyword in Cargo.toml causing error

Author: ricvelozo

Cargo.toml

@@ -9,7 +9,7 @@ Parse and generate random CPF/ICN and CNPJ, Brazil's ID numbers.
 edition = "2018"
 repository = "https://gitlab.com/ricvelozo/brids-rs"
 documentation = "https://docs.rs/brids"
-keywords = ["parser", "format", "validation", "cpf", "cnpj", "serde"]
+keywords = ["parser", "format", "validation", "cpf", "cnpj"]
 categories = ["parser-implementations", "value-formatting"]
 readme = "README.md"