Merge tag '0.7' into develop

Version 0.7
Merge tag '0.7.1' into develop

Version 0.7.1
Merge tag '0.7.2' into develop

Version 0.7.2
Merge tag '0.7.3' into develop

Version 0.7.3
Merge tag '0.7.4' into develop

Version 0.7.4
feat: switch to pyannote.core 0.2 JSON format
docs: CHANGELOG
Merge branch 'release/0.8'