Improvements, and new icon.

Up to five colour-coded lists — swipe between them to keep different trips separate.
• Rename any list and pick its background colour from six soft pasettes.
• Siri Shortcuts: say "Add item to Shoppalist" without opening the app.
• Apple Watch complication now shows your live unchecked item count.
• Undo bar catches accidental deletions and check-offs.
• Smart history suggestions appear as you type.
• Share your list via iMessage or any share sheet with one tap.
• Bug fixes and performance improvements.