message: Updates Changeling.md
diff: ### 0.1.0 (unreleased)
  -#### prerelease 5
  +#### prerelease 6
  - Fixes MacOS/X handling of modifiers (and startup).
  +
  +#### prerelease 5
  +
  - Adds VT sequence `CSI 16 t` for retrieving cell dimension in pixels.
  #### prerelease 4
  