Tasksh in Homebrew

Tasksh, the Taskwarrior Shell, can now be installed using Homebrew on the Mac:

$ brew install tasksh

This means that all three related Taskwarrior family members can now be installed via Homebrew:

$ brew install task
...
$ brew install taskd
...
$ brew install tasksh
...

Existing Homebrew users can obtain the formulae:

$ brew update
...

Then later upgrade their Task software easily:

$ brew upgrade
...