docs: Import print_function in reformat-news.py
The script already works perfectly fine with Python 2, but that's more by chance than by design: we have a single occurrence of print(), and it just so happens that its only argument is an expression. Importing print_function makes the script more future, err, past proof. Signed-off-by: NAndrea Bolognani <abologna@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>
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