Bump up version 1.28.0 again

Merge pull request #799 from emacs-php/release/v1.27.0

Release v1.27.0

Bump up version 1.26.1

Merge pull request #787 from emacs-php/release/v1.26.0

Bump up version 1.26.0

Merge pull request #769 from emacs-php/release/1.25.1

Release 1.25.1

Merge pull request #752 from emacs-php/release/1.24.4

Release 1.25.0

Merge pull request #734 from emacs-php/release/v1.24.3

Bump up version 1.24.3

Merge pull request #722 from emacs-php/release/1.24.2

Bump up version 1.24.2

Fix typo

Merge pull request #655 from emacs-php/release/1.24.0

Release v1.24.0