Update to the KNC Miner promo!

Another update to the KNC Miner promo!Changes in the hashrate requirements: Originally it was 10GH/s for 15 days, this is going to change a little, including the 5GH/s promo we have promised before, the new requirements are: 5 Days of 5 GH/s* required. 5 Days of 7,5 GH/s* required. 5 Days of 10 GH/s* required …