fix describe when using #[implements] (#169)

[ci skip]

Author: davidcole1340

crates/macros/src/module.rs

@@ -230,7 +230,7 @@ impl Describe for Class {
         let interfaces = self
             .interfaces
             .iter()
-            .map(|iface| quote! { #iface.into(), });
+            .map(|iface| quote! { #iface.into() });
         let properties = self.properties.iter().map(|d| d.describe());
         let mut methods: Vec<_> = self.methods.iter().map(Describe::describe).collect();
         let docs = self.docs.iter().map(|c| {