Fix authors field in Cargo.toml

The field is an array, so we should use it like that... :D

Cargo.toml

@@ -2,7 +2,7 @@
 edition = "2021"
 name = "cargo-manifest"
 version = "0.14.0"
-authors = ["Kornel <[email protected]>, Luca Palmieri <[email protected]>"]
+authors = ["Kornel <[email protected]>", "Luca Palmieri <[email protected]>"]
 description = "Helper crate to parse and manipulate manifests - `Cargo.toml` files."
 keywords = ["cargo", "metadata", "toml", "serde", "manifest"]
 categories = ["rust-patterns", "parser-implementations"]