fix lacking feature in syn

Author: makspll

bevy_mod_scripting_derive/Cargo.toml

@@ -19,7 +19,7 @@ path = "src/lib.rs"
 
 [dependencies]
 paste = "1.0.7"
-syn = {version="1.0.57",features=["full","fold"]}
+syn = {version="1.0.57",features=["full","fold","extra-traits"]}
 quote = "1.0.8"
 proc-macro2 = "1.0"
 convert_case = "0.5.0"