Address a number of clippy complaints

src/padfoot/connection/avatars.rs

@@ -11,9 +11,11 @@ impl AsRef<dyn telepathy::ConnectionInterfaceAvatars + 'static> for std::rc::Rc<
     }
 }
 
+type AvatarRequirementSpec = (Vec<String>, u16, u16, u16, u16, u32);
+
 // TODO: come back and do this properly, I'm just putting it in for consistency
 impl telepathy::ConnectionInterfaceAvatars for Connection {
-    fn get_avatar_requirements(&self) -> Result<(Vec<String>, u16, u16, u16, u16, u32), MethodErr> {
+    fn get_avatar_requirements(&self) -> Result<AvatarRequirementSpec, MethodErr> {
         println!("Connection<{}>::get_avatar_requirements()", self.id);
         Ok((vec![], 0, 0, 0, 0, 0))
     }