Snippet format update

To match the starter (for the migration)

snippets/omitBy.md

@@ -1,4 +1,7 @@
-### omitBy
+---
+title: omitBy
+tags: object,array,function,intermediate
+---
 
 Creates an object composed of the properties the given function returns falsy for. The function is invoked with two arguments: (value, key).
 
@@ -14,4 +17,4 @@ const omitBy = (obj, fn) =>
 
 ```js
 omitBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { b: '2' }
-```
+```