v0.3.0

New features:
- ask if not existing directories should be created in backup plan setup wizard
  commit 6ae9b0e6c4dd3e29af36d3690d7621c33c5e4fb7

Bugfixes:
- don't crash if path is root directory of a USB stick
  commit 881da642c3f501a976f4b46940e2d7e1f83c6c3a