Update CHANGELOG from v0.9.27 to v0.9.28 with issue links (buefy#3964)

* docs: update CHANGELOG.md

- Prepends changes from v0.9.27 to v0.9.28.
  Tells v0.9.26 was withdrawn due to missing `dist` folder in the
  package.

* docs: link CHANGELOG to relevant issues

- `CHANGELOG.md` now has working links to relevant issues.

  I replaced the issue numbers in `CHANGELOG.md` with the Python script
  available from the following repo:
  https://github.com/kikuomax/link-commit-hash

issue buefy#3960