message: Changelog.md: Adds TL;DR to next release.
diff: ### 0.3.0 (unreleased)
  +**TL;DR** Many thanks to all for the great support and feedback. This release
  +marks a huge milestone for me especially with regards to VT backend performance(!),
  +improved rendering architecture, and a more complete list of pixel perfect box drawings.
  +
  - Fixes installation from `.deb` (missing terminfo dependency)
  - Fixes PTY write race condition.
  - Fixes VT sequence `DECFI`.
  