• FEATURE: colibris is now the default skin for new installs
• FEATURE: improved colibris visuals, and migrated to Flexbox layout
• FEATURE: skin variants: colibris skin colors can be easily customized. Visit http://127.0.0.1:9001/p/test#skinvariantsbuilder
• REQUIREMENTS: minimum required Node version is 10.13.0 LTS.
• MINOR: stability fixes for the async migration in 1.8.0 (fixed many UnhandledPromiseRejectionWarning and the few remaining crashes)
• MINOR: improved stability of import/export functionality
• MINOR: fixed many small UI quirks (timeslider, import/export, chat)
• MINOR: Docker images are now built & run in production mode by default
• MINOR: reduced the size of the Docker images
• MINOR: better documented cookies and configuration parameters of the Docker image
• MINOR: better database support (especially MySQL)
• MINOR: additional test coverage
• MINOR: restored compatibility with ep_hash_auth
• MINOR: migrate from swagger-node-express to openapi-backend
• MINOR: honor the Accept-Language HTTP headers sent by browsers, eventually serving language variants
• PERFORMANCE: correctly send HTTP/304 for minified files
• SECURITY: bumped many dependencies. At the time of the release, this version has 0 reported vulnerabilities by npm audit
• SECURITY: never send referrer when opening a link
• SECURITY: rate limit imports and exports
• SECURITY: do not allow pad import if a user never contributed to that pad
• SECURITY: expose configuration parameter for limiting max import size

BREAKING CHANGE: undoing the "clear authorship colors" command is no longer supported (see #2802)
BREAKING CHANGE: the visuals and CSS structure of the page was updated. Plugins may need a CSS rehaul