v0.9.1

Fix Taskfile: Run Task failing to open the task picker with current versions of
Task. Task's space-aligned output could cause a ValueError in v0.8.0 (#6).

Task discovery now reads task --list-all --json, removing its dependence on
human-readable formatting. Task descriptions, multiline descriptions and included
tasks remain available in the picker. Invalid listings show a status message
instead of raising an exception.