Merge pull request #143 from rejeep/emacs-28.1

Add Emacs 28.1 support

Merge pull request #141 from rejeep/emacs-27.2

Add Emacs 27.2 support

Merge pull request #137 from rejeep/update-snapshots

Update Git snapshots to Emacs 28 development

Merge pull request #136 from rejeep/emacs-27.1

Add Emacs 27.1 support

Merge pull request #133 from sambrightman/update-snapshots

Update snapshots

Merge pull request #130 from rejeep/travis-os-matrix

Add new Git snapshot versions, including Xenial compatibility

Fix typos

Merge pull request #129 from rejeep/travis-os-matrix

Add Xenial support

Update URL to point at official release tarball

Merge pull request #121 from sambrightman/new-versions

Add new versions