[pkg-tasktools] Bug#829582: does not depend on taskwarrior

[Iain R. Learmonth]

Control: fixed -1 1.0.0-2

Hi,

I already had this on my list to fix and didn't realise a bug had been
filed.

I also did not realise that Sebastien had already made a fix in the in
the git too, oops.

Thanks,
Iain.