[ ] make README.md and commit if needed
[ ] make man/pandoc.1 and commit if needed
[ ] Finalize changelog
    git log --pretty='format:%n%n* %s (%an)%n%b%n%h%n' \
      --reverse --name-only LASTRELEASE..HEAD > LOG
[ ] make packages
[ ] make update-website
[ ] make trypandoc
[ ] Tag release in git
[ ] make pandoc-templates
    cd ../pandoc-templates
    git tag REL
    git push
    git push --tags
[ ] Add release on github (use 'make changes_github' and upload files)
[ ] stack upload .
[ ] Announce on pandoc-announce, pandoc-discuss