[libata] bump versions

Bump versions based on changes submitted during 2.6.21 merge window.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/pata_sis.c b/drivers/ata/pata_sis.c
index efa530b..be30092 100644
--- a/drivers/ata/pata_sis.c
+++ b/drivers/ata/pata_sis.c
@@ -35,7 +35,7 @@
 #include "sis.h"
 
 #define DRV_NAME	"pata_sis"
-#define DRV_VERSION	"0.4.5"
+#define DRV_VERSION	"0.5.0"
 
 struct sis_chipset {
 	u16 device;			/* PCI host ID */