Merge pull request #2704 from HaxeFoundation/development

3.1.0
set changes.txt date
Merge pull request #2707 from HaxeFoundation/development

3.1.0 hotfix
Update README.md
Merge pull request #2761 from HaxeFoundation/development

3.1.1
update release-checklist.txt
Merge branch 'master' into development

Conflicts:
	README.md