Snippet format update

To match the starter (for the migration)

snippets/isValidJSON.md

@@ -1,4 +1,7 @@
-### isValidJSON
+---
+title: isValidJSON
+tags: type,json,intermediate
+---
 
 Checks if the provided string is a valid JSON.
 
@@ -19,4 +22,4 @@ const isValidJSON = str => {
 isValidJSON('{"name":"Adam","age":20}'); // true
 isValidJSON('{"name":"Adam",age:"20"}'); // false
 isValidJSON(null); // true
-```
+```