v15.0:

- now miner supports up to #384 epoch (4GB DAG size). Note that previous versions support up to #299 epoch, you will not be able to use old versions after #299 epoch.
- added support for Navi cards (ETH-only mode).
- now miner sets environment variables automatically (required for 4GB AMD cards).
- a few minor bug fixes and improvements.

PS. AMD still has no public Navi drivers with DAG-fix, so currently 5700XT shows a very bad hashrate. But AMD already solved this issue and they promise to release public drivers soon...