fixup! Add Layers::iter()

Author: matthiasbeyer

src/config/layers.rs

@@ -129,7 +129,7 @@ impl Layers {
     ///
     /// This is useful if you want to access all values of each layer (even the shadowed ones) for
     /// example for debug analysis of the loaded configuration values.
-    pub fn iter(&self) -> impl Iterator<Item = ConfigObject> {
+    pub fn iter(&self) -> impl Iterator<Item = &ConfigObject> {
         self.0.iter()
     }
 }