Merge pull request #48 from dirkwinkhaus/fix-statement-connection

use interface to be compatible

src/Statement.php

@@ -37,7 +37,7 @@ class Statement extends \Doctrine\DBAL\Statement
      * @param $sql
      * @param Connection $conn
      */
-    public function __construct($sql, Connection $conn)
+    public function __construct($sql, ConnectionInterface $conn)
     {
         // Mysqli executes statement on Statement constructor, so we should retry to reconnect here too
         $attempt = 0;