Bump engine requirement
Update CHANGELOG.md prior to v0.13.0
Prepare 0.13.0 release
Add `sync` method to Opener, with implementation for SkimOpener
Add syncing with keymap ctrl-alt-s
Combine sync and open methods
Update `@pdfFile` when the result has been moved
Send sync arguments to opener
Introduce new `getEditorDetails` function
:lipstick: