Demo updates, readme update

Demo_Keyboard.py

@@ -12,11 +12,13 @@ with sg.FlexForm("Keyboard Test", return_keyboard_events=True, use_default_focus
     form.Layout(layout)
     # ---===--- Loop taking in user input --- #
     while True:
-        button, value = form.ReadNonBlocking()
+        button, value = form.Read()
 
         if button == "OK" or (button is None and value is None):
             print(button, "exiting")
             break
+        if len(button) == 1:
+            text_elem.Update(new_value='%s - %s'%(button, ord(button)))
         if button is not None:
             text_elem.Update(button)