update usage.rst

Updated to make reference to VS Code using this library.

docs/docs/usage.rst

@@ -48,6 +48,10 @@ Kate:
   <https://projects.kde.org/projects/kde/applications/kate/repository/entry/addons/kate/pate/src/plugins/python_autocomplete_jedi.py?rev=KDE%2F4.13>`__,
   you have to enable it, though.
 
+Visual Studio Code:
+
+- Python_
+
 Atom:
 
 - autocomplete-python_
@@ -112,3 +116,4 @@ Using a custom ``$HOME/.pythonrc.py``
 .. _GNOME Builder: https://wiki.gnome.org/Apps/Builder/
 .. _gedi: https://github.com/isamert/gedi
 .. _Eric IDE: http://eric-ide.python-projects.org
+.. _Python: https://marketplace.visualstudio.com/items?itemName=donjayamanne.python