message: Update README to specify where to run flit
diff: @@ -40,7 +40,7 @@ To install them, you need [Flit][], so run this:
  $ pip install --user flit
  -Then use Flit to install symlinks to the tools:
  +Then, go to the `bril-txt` directory and use Flit to install symlinks to the tools:
  $ flit install --symlink --user
  