Snippet format update

To match the starter (for the migration)

snippets/pick.md

@@ -1,4 +1,7 @@
-### pick
+---
+title: pick
+tags: object,array,intermediate
+---
 
 Picks the key-value pairs corresponding to the given keys from an object.
 
@@ -11,4 +14,4 @@ const pick = (obj, arr) =>
 
 ```js
 pick({ a: 1, b: '2', c: 3 }, ['a', 'c']); // { 'a': 1, 'c': 3 }
-```
+```