catch interrupt and shutdown properly
catch interrupt and shutdown properly

visvirial/Sia-GPU-Miner,KlausT/Sia-CUDA-Miner,KlausT/Sia-CUDA-Miner,funguito/Sia-GPU-Miner,visvirial/Sia-GPU-Miner,funguito/Sia-GPU-Miner,NebulousLabs/Sia-GPU-Miner,NebulousLabs/Sia-GPU-Miner