EDIT: pre-release. Please wait for v0.24.1

Thanks to @dieterb we have a new application shipped alongside dstask --
dstask-import which allows tasks to be imported from other sources; right
now github issues and taskwarrior. See
https://github.com/naggie/dstask/blob/master/doc/dstask-import.md for more
information.

All importing has been separated to this executable as importing is considered
out of scope for the main (core) dstask.

There are many bugfixes in this release and in general the user experience is
better -- thanks to everyone that made a PR or filed an issue.

Features

• Much better out-of-box user experience -- dstask offers to create the git repo if it does not exist.
• show-projects now orders projects alphabetically
• CLI argument validation is much improved -- rather than silently ignoring arguments that don't make sense.
• Better CI thanks to @dieterb

Bugfixes

• No "fatal" git error on first task add #109
• Now possible to run dstask help before the git repository has been initialised #104
• Text-searching is case-insensitive again #102

Admin

• We now have an unofficial MacOS homenbrew package for dstask thanks to @alebcay, to go with
  the AUR package, NixOS and FreeBSD package.
• There is a slack channel at https://gophers.slack.com/ on channel #dstask.