4.0.0-rc.1

Breaking Changes

• Upgrade to Hexo 5.0
• Update schema version to 4.0.0
• Require Node.js version 10.13.0 or higher
• Use page tags instead of page keywords in Open Graph

New Features

• Allow theme to be installed via NPM
• Support _config.icarus.yml configuration file

Improvements

• Re-enable Hexo's meta_generator and external_link filters