Merge pull request RustPython#1971 from youknowone/fix-clippy

Fix last clippy error of 0.0.212

Author: coolreader18

vm/src/obj/objdict.rs

@@ -550,7 +550,7 @@ macro_rules! dict_iterator {
         #[pyimpl]
         impl $name {
             fn new(dict: PyDictRef) -> Self {
-                $name { dict: dict }
+                $name { dict }
             }
 
             #[pymethod(name = "__iter__")]