Snippet format update

To match the starter (for the migration)

snippets/unzip.md

@@ -1,4 +1,7 @@
-### unzip
+---
+title: unzip
+tags: array,intermediate
+---
 
 Creates an array of arrays, ungrouping the elements in an array produced by [zip](#zip).
 
@@ -18,4 +21,4 @@ const unzip = arr =>
 ```js
 unzip([['a', 1, true], ['b', 2, false]]); // [['a', 'b'], [1, 2], [true, false]]
 unzip([['a', 1, true], ['b', 2]]); // [['a', 'b'], [1, 2], [true]]
-```
+```