v1.4.0

• Add experimental support for compressing chunks when using code splitting
• Add delay option for additional files that are written outside the plugin lifecycle
• Assume a default delay of 5000ms in rollup 0.60.0-0.62.0 as a workaround for changed behavior (fixes #2)
• Remove dependency to node-zopfli to prevent installing it by default which is failing at the moment (fixes #3)