Merge Changelog.md, Authors, UPGRADE.md into 1.3-dev

Hello,

we need to merge Merge Changelog.md, Authors, UPGRADE.md into 1.3-dev and 1.4-dev to have those file in sync with the fixes branch

Cheers

created branch 5836-merge-changelog-md-authors-upgrade-md-into-1-3-dev

By bmortier on 2018-05-11T14:23:35 (imported from GitLab)

mentioned in merge request !271

By bmortier on 2018-05-11T14:23:37 (imported from GitLab)

closed via merge request !271

By bmortier on 2018-05-11T15:03:37 (imported from GitLab)

mentioned in commit 5f33e7b3

By bmortier on 2018-05-11T15:03:37 (imported from GitLab)

mentioned in commit c76b8fb3

By bmortier on 2018-05-11T15:04:00 (imported from GitLab)

mentioned in merge request !272

By bmortier on 2018-05-11T15:04:05 (imported from GitLab)

added release label

By bmortier on 2018-06-12T20:37:29 (imported from GitLab)

changed milestone to %FusionDirectory 1.3

By bmortier on 2019-03-01T15:58:15 (imported from GitLab)