Return the name of each content item.

Author: jaraco

importlib_resources/abc.py

@@ -73,4 +73,4 @@ def is_resource(self, path):
         return self.files().joinpath(path).isfile()
 
     def contents(self):
-        return map(str, self.files().iterdir())
+        return (item.name for item in self.files().iterdir())