message: Changelog.md: Adds missing entry to last PR merge.
diff: ### 0.3.2 (unreleased)
  - Adds E3 capability, so `clear` now defaults to clearing screen and scrollback (#693).
  +- Fixes SGR 8 (Conceal/Hidden) attribute doesn't work as expected (#699).
  - Fixes Synchronized Updates (`SM/RM ? 2026`) sometimes lagging behind in rendering.
  - Fixes SGR and text breakage when altering charsets via `ESC ( 0` VT sequence (#661).
  - Fixes SEGV when closing the terminal via GUI close button.
  