v1.3.1

SimpleSpread v1.3.1

Changes since v1.3.0

A native macOS spreadsheet: XLSX native format, CSV import/export,
and a Google-Sheets-level formula engine.

Note: This build is arm64 (Apple Silicon) only.
If Gatekeeper blocks the app, right-click → Open on first launch.

Commit Summary

• Fill out the toolbar: undo/redo, format painter, fonts, decimals, AutoSum (5d38edb)
• Docs: a guide to pivot tables (4ab6ce3)
• appcast: SimpleSpread 1.3.0 (96fa056)