Bump version to 1.2.0

Bump version to 1.1.0

Improve `setCallbacks` doc

Co-authored-by: Brian Sweeney <[email protected]>

Bump version to 1.0.2

Bump version to 1.0.1

Bump version to 0.8.6

Bump version to 0.8.6

Merge pull request dompdf#2088 from dompdf/develop

Preparation for 0.8.5 release

Merge pull request dompdf#2053 from dompdf/develop

Final update for 0.8.4

Tag for release version 0.8.3