Release 2.9.1 

Update composer.json 

Allow installation with DataModel 8.x 

Fix 2.7.0 release date (today) 

Release 2.6.0 (#237) 

Merge pull request #234 from wmde/rel250 Release 2.5.0

Merge pull request #218 from wmde/release240 Release 2.4.0

Release 2.3.0 (#213) 

Merge pull request #195 from wmde/release220 Release 2.2.0

Update release notes for 2.1.0