Add version to title of IDLE help window.

Lib/idlelib/help.py

@@ -26,6 +26,7 @@ show_idlehelp - Create HelpWindow.  Called in EditorWindow.help_dialog.
 """
 from html.parser import HTMLParser
 from os.path import abspath, dirname, isfile, join
+from platform import python_version
 from tkinter import Toplevel, Frame, Text, Menu
 from tkinter.ttk import Menubutton, Scrollbar
 from tkinter import font as tkfont
@@ -265,7 +266,7 @@ def show_idlehelp(parent):
     if not isfile(filename):
         # try copy_strip, present message
         return
-    return HelpWindow(parent, filename, 'IDLE Help')
+    HelpWindow(parent, filename, 'IDLE Help (%s)' % python_version())
 
 if __name__ == '__main__':
     from idlelib.idle_test.htest import run