Snippet format update

To match the starter (for the migration)

snippets/splitLines.md

@@ -1,4 +1,7 @@
-### splitLines
+---
+title: splitLines
+tags: string,beginner
+---
 
 Splits a multiline string into an array of lines.
 
@@ -10,4 +13,4 @@ const splitLines = str => str.split(/\r?\n/);
 
 ```js
 splitLines('This\nis a\nmultiline\nstring.\n'); // ['This', 'is a', 'multiline', 'string.' , '']
-```
+```