Update README.md

Author: zelenko

README.md

@@ -1,10 +1,10 @@
 # [![MongoDB](https://webassets.mongodb.com/_com_assets/cms/MongoDB-Logo-5c3a7405a85675366beb3a5ec4c032348c390b3f142f5e6dddf1d78e2df5cb5c.png)](https://www.mongodb.com/download-center#community)
 
-## Overview
+# CRUD operations
 This PHP code has examples of CRUD operations in MongoDB using the [Mongo PHP Driver 1.2.9](https://github.com/mongodb/mongo-php-driver/releases/tag/1.2.9)
 
 
-### Features
+## Features
 
 * `new MongoDB\Driver\Query`
 * `new MongoDB\Driver\Command`