Update and maintenance release:
- cleanup, optimize and improve memory usage
- update miner Z-Enemy to v1.21
As usual: press [U] to update, or exit RainbowMiner and start "Updater.bat" (or let RainbowMiner do the work, if you have set "EnableAutoUpdate" to 1)
Important remark: users who are still using v3.8.7.4 (or below), together with PowerShell 6.0.2 (or below) should exit RainbowMiner and start "Updater.bat" by hand. After that, all automatic updates will work again :)