removed dibi::$defaultDriver (BC break)

src/Dibi/Connection.php

@@ -76,7 +76,7 @@ class Connection
 		Helpers::alias($config, 'result|formatDateTime', 'resultDateTime');
 
 		if (!isset($config['driver'])) {
-			$config['driver'] = \dibi::$defaultDriver;
+			$config['driver'] = 'mysqli';
 		}
 
 		if ($config['driver'] instanceof Driver) {

src/Dibi/dibi.php

@@ -64,9 +64,6 @@ class dibi
 	/** @var int  Number or queries */
 	public static $numOfQueries = 0;
 
-	/** @var string  Default dibi driver */
-	public static $defaultDriver = 'mysqli';
-
 	/** @var Dibi\Connection[]  Connection registry storage for Dibi\Connection objects */
 	private static $registry = [];