noted better bluetooth

src/x301/hardware.md

@@ -25,6 +25,8 @@ modifications would be a good idea. Some things I would like to do are:
    is very well supported by open-source drivers.
 6. Use a microSata to MSata converter in order to use faster and more modern
    SSDs, this will increase the responsitivity of the machine by a lot.
+7. Upgrade the bluetooth module from 2.0 to 4.0, this is not only for better
+   speeds but also for better power saving.
 
 ## Display Panel Replacement