v12.0:

- zero devfee for all 2GB and 3GB cards in all operating systems.
- reduced devfee for dual mode, now it is 1%, same as for ETH-only mode.
- a bit reduced required GPU memory (both AMD and NVIDIA) so you can mine ETH a bit longer on cards that don't have enough memory.
- added version for CUDA 10.0, it is a bit faster for latest 20xx NVIDIA cards.
- a few minor bug fixes and improvements.

Linux version will be available a bit later.