Release 1.0.0-rc.21

• Remove mainCode property from Package (We have a file browser now) (b4ebbbe)
• Fix #40: revert "do not clear search on go to packageDetail via searchbar" (427693c)
• CLI: fix spawn command for windows (77a63e7)
• Improve highlightable detection (ad4e479)
• Release it: avoid asynchronous version number in package-lock.json (a064d8b)
• install dependencies (ac61599)