Fixed a small mistake where method getDefaultSchemaName was declared as...

Fixed a small mistake where method getDefaultSchemaName was declared as protected instead of public.

lib/Doctrine/DBAL/Platforms/AbstractPlatform.php

@@ -2758,7 +2758,7 @@ abstract class AbstractPlatform
      *
      * @throws \Doctrine\DBAL\DBALException If not supported on this platform.
      */
-    protected function getDefaultSchemaName()
+    public function getDefaultSchemaName()
     {
         throw DBALException::notSupported(__METHOD__);
     }