v0.15.0

Fixed

• Safari prevents moving slide after too many navigations (#158, #160)
• Custom engine doesn't render code blocks well (#168, #172)
• Support preview mode in macOS Catalina (#173)
• Update Dockerfile to work Chromium correctly (#174)

Changed

• Upgrade Marpit v1.4.1 and Marp Core v0.14.0 (#169)
• Upgrade dependent packages to the latest version (#164, #169)

Removed

• Remove the detection of helper script from resolved engine (#171)