Release 0.1.2

Changes:
- Fixed cvat-ai#14 (docker-compose down command as written in the readme does not remove volumes)
- Fixed cvat-ai#15 (All checkboxes in temporary attributes are checked when reopening job after saving the job)
- Fixed cvat-ai#18 (Extend contributing.md)
- Fixed cvat-ai#19 (Using the same attribute for label twice -> Stuck)

Release 0.1.1

    * video from share hotfix & dump hotfix
    * Added contributors
    * Added screenshot, documentation, screencasts into README.md
    * Fixed GitHub documentation

Release 0.1.0