Little-known Homebrew tip: Python applications are installed in their own Homebrew-managed virtual environment, which means you can run pip in them to upgrade to the latest version of packages even when the tap hasn't been updated yet.

I just tried this and it worked - now "vd" gives my Visidata 2.0 on my system:

    /usr/local/Cellar/visidata/1.5.2/libexec/bin/pip install -U visidata