Correct "type" to "fsType" in fileSystems attr.

Well, obviously, the generated output from nixpart can't be evaluated, so let's
fix this typo :-)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Bump version number to 0.2.1.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>