v0.0.6

- DONE Test that the title/label of the entity is set when syncing to avoid a 400 error
- DONE Before making the request, ensure that everything is ok (checklist needs the card id, items needs the checklist id, etc...)
- DONE Up the demo video in the beginning of the readme
- DONE Improve readme with links to org-mode and trello
- DONE Improve readme's use cases
- DONE Mention the possible errors
- DONE Mention the emacs version
- DONE Update release notes
- DONE Make a release