Snippet format update

To match the starter (for the migration)

snippets/lowercaseKeys.md

@@ -1,4 +1,7 @@
-### lowercaseKeys
+---
+title: lowercaseKeys
+tags: object,intermediate
+---
 
 Creates a new object from the specified object, where all the keys are in lowercase.
 
@@ -16,4 +19,4 @@ const lowercaseKeys = obj =>
 ```js
 const myObj = { Name: 'Adam', sUrnAME: 'Smith' };
 const myObjLower = lowercaseKeys(myObj); // {name: 'Adam', surname: 'Smith'};
-```
+```