Update composer dependencies.
Update nubs/sensible in order to use the useful editData.

The _amendReleaseNotes method can be greatly simplified now that
nubs/sensible provides a way of spawning the user's editor to edit a
string.
Fix name of variable in phpdoc.
Merge pull request #46 from nubs/sensible-editor-0.2.0

Update nubs/sensible in order to use the useful editData.