Features

• #645 : paste images from the clipboard
• #640 : backup up to 10 sessions in indexeddb
• #751 : gif export play once
• #729 : workaround for data-uri PNG export

Bug Fixes & improvements

• #750 : mirror pen bug with even pen sizes
• #727 : cleanup UI for import

Development

• #745: Support https

Check the full changelist at : juliandescottes/piskel@v0.12.1...v0.13.0