v0.26.0

Added

• Scenes can now have an optional description. Add one from the scene editor via
  the "+ Add description" link below Scope. On the panel it appears as a "?"
  tooltip next to the scene name, and inline beneath the scene when you expand
  it.
• Undo / redo for scene changes: the panel now keeps the last 30 scene edits in
  memory. Use the Undo and Redo buttons at the top of the panel — or Ctrl/⌘+Z and
  Ctrl/⌘+Shift+Z — to step back and forward through add, edit, delete, reorder,
  unpin and enable/disable changes. A caption beside the buttons always names
  the next change. The history is shared across browser tabs (which refresh
  automatically when you change scenes elsewhere) and clears when Home Assistant
  restarts.

Full Changelog: v0.25.0...v0.26.0