0.5.7

- [X] Backlog
- [X] Update version
- [X] Fix default keyword when not specified (trello list name) - [[https://github.com/org-trello/org-trello/issues/183][#183]]
- [X] Remove reference to proxy in log messages
- [X] Sync buffer from trello - Ignore errors when there is nothing to sort.
- [X] Sync buffer from trello - Fold buffer entries when done.
- [X] Fix bug on (orgtrello-entity/compute-card-region!)
- [X] Release notes