0.12.0

What's Changed

• add configs/darwinia.yml by @spazcoin in #763
• improve logging by @ermalkaleci in #767
• Prefetch storage by @qiweiii in #764
• Api fetching status indicator on tty by @ermalkaleci in #768
• 0.12.0 by @qiweiii in #769

Full Changelog: 0.11.0...0.12.0