Issue #3068: Add Idle extension configuration dialog to Options menu.
Original patch by Tal Einat.
diff --git a/Lib/idlelib/Bindings.py b/Lib/idlelib/Bindings.py
index df2b251..2072c7e 100644
--- a/Lib/idlelib/Bindings.py
+++ b/Lib/idlelib/Bindings.py
@@ -75,7 +75,8 @@
    ('!_Auto-open Stack Viewer', '<<toggle-jit-stack-viewer>>'),
    ]),
  ('options', [
-   ('_Configure IDLE...', '<<open-config-dialog>>'),
+   ('Configure _IDLE', '<<open-config-dialog>>'),
+   ('Configure _Extensions', '<<open-config-extensions-dialog>>'),
    None,
    ]),
  ('help', [