Release v2.9.0 (ivadomed#989)

Release v2.8.0 (ivadomed#925)

* Release 2.8.0 
Added 2.8.0 PR summary from Changelog-Neuropoly and updated version.txt

Release 2.7.4 (ivadomed#724)

* release 2.7.3 changelog and version

* update to 2.7.4

release 2.7.3 changelog and version (ivadomed#723)

Release 2.7.2 (ivadomed#689)

* update change log

* increment version number

* update changes with new PR

increment release version (ivadomed#676)

Release 2.7.0 (ivadomed#675)

* Update change log

* increment version number

Release 2.6.1 (ivadomed#581)

* increment ivadomed version

* update CHANGED.md

Release v2.6.0 (ivadomed#536)

* update CHANGES.md

* increment version number

Release 2.5.0 (ivadomed#520)

* update CHANGES.md

* increment version #