Updating README with version 1.4.0 featues

Author: nathancarter

README.md

@@ -10,15 +10,20 @@ integrated into GAP or its build system.
 
 ## Purpose
 
-This package adds visualization tools to GAP for use in Jupyter notebooks.
-These include standard line and bar graphs, pie charts, scatter plots, and
-graphs in the vertices-and-edges sense.
+This package adds visualization tools to GAP that can be used either in
+Jupyter notebooks or from the GAP REPL. These include standard line and bar
+graphs, pie charts, scatter plots, and graphs in the vertices-and-edges
+sense.
 
 ## Implementation
 
-These are implemented by importing existing JavaScript visualization
-libraries into the notebook as needed, based on the kind of visualization
-requested by the GAP code.
+In a Jupyter notebook, these visualizations are implemented by importing
+existing JavaScript visualization libraries into the notebook as needed,
+based on the kind of visualization requested by the GAP code.
+
+Outside of the notebook, a visualization command creates a temporary HTML
+file with the Javascript code and JSON data needed to build the
+visualization, then displays it using the system default web browser.
 
 The architecture of the package is such that additional JavaScript
 visualization libraries can be added easily.
@@ -30,7 +35,7 @@ The package does not need to be compiled.
 See the manual on [the package website](http://nathancarter.github.io/jupyterviz),
 which contains many usage examples.
 
-Or experiment with a live notebook on Binder:
+Or experiment with a live Jupyter notebook on Binder:
 [![Binder](https://mybinder.org/badge.svg)](https://mybinder.org/v2/gh/nathancarter/jupyterviz/master?filepath=inst%2Fgap-4.10.0%2Fpkg%2Fjupyterviz%2F).
 (It can be a long loading time, so have patience!)