rel-v8-20210114
- `[fix] use history@4 with react-router@5` - `[fix] handle ssr off when loading subapp` - `[fix] bad if to check for initial CDN map data`
- `[fix] use history@4 with react-router@5` - `[fix] handle ssr off when loading subapp` - `[fix] bad if to check for initial CDN map data`