v1.1.0-rc.6

Improvements

• Optimize performance of external demo watch logic, HMR 2x faster, 646dd4a
• Add cache for demo dependency collect logic, HMR 10x faster, b144e36
• Modify the way to get lerna version, to compatible with lerna-based tools
• Add IDE related files into gitignore for scaffolds, #401

Fixed

• Local package resolve bug if child dependency has the old version of some local package
• Doc file updated time fallback logic