make authors an array

Cargo.toml

@@ -2,6 +2,10 @@
 name = "smallint"
 version = "0.1.0"
 edition = "2021"
+authors = ["artofrev"]
+description = "A library for optimized arbitrary precision integers."
+license = "MIT"
+
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html