v0.2.0

This time we worked on usability of Proportio. Try it!

New features

• Flexible export file format by @stepanzh in #6
• Copy to clipboard optimized for spreadsheets by @stepanzh in #13

UI/UX

• Focusing on newly added item by @stepanzh in #8
• One empty item is left after clearing item list by @stepanzh in #10
• Migration to new icon set by @stepanzh in #15

Full Changelog: v0.1.2...v0.2.0