• Add support for watching files provided by the contentBase option. Enable with watchContentBase: true or --watch-content-base in the CLI (#649).
• Support IPv6 addresses as host option (#644).
• Fix historyApiFallback taking preference of contentBase files instead of the in-memory files; this caused issues with html-webpack-plugin (#640).
• Fix edge case where rapidly refreshing the page caused the server to crash (#637).