Update Cargo.toml files

enumscribe_derive/Cargo.toml

@@ -4,6 +4,7 @@ version = "0.1.0"
 authors = ["Tom Panton <pantonshire@gmail.com>"]
 edition = "2018"
 license = "MIT"
+repository = "https://github.com/Pantonshire/enumscribe"
 description = "Procedural macros for converting between enums and strings"
 
 [lib]