#49 demo/HistroyText.py on Python3: no __next__

[buhtz]

I build and installed the download with Python3 on Debian unstable. Some demos working.

"HistoryText.py" create an error

$ python3 ./HistoryText.py
Traceback (most recent call last):
  File "./HistoryText.py", line 101, in <module>
    widget = Demo(root)
  File "./HistoryText.py", line 41, in __init__
    ['Next', self.historyText.__next__],
AttributeError: 'HistoryText' object has no attribute '__next__'