Merge tag '0.6' into develop

Version 0.6
Merge tag '0.6.1' into develop

Version 0.6.1
docker: wip
Merge tag '0.6.2' into develop

Version 0.6.2
docker: use base pyannote/core image
feat: add /error/regression
feat: add /error/difference
doc: CHANGELOG
Merge branch 'release/0.7'