improve readme

README.md

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 # PHP-CRUD-API
 
-Single file PHP 7 script that adds a REST API to a MySQL, PostgreSQL, SQL Server or SQLite database. 
+Single file PHP 7 script that adds a REST API to a MySQL/MariaDB, PostgreSQL, SQL Server or SQLite database. 
 
 NB: This is the [TreeQL](https://treeql.org) reference implementation in PHP.