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: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

docs/reformat-news.py

@@ -21,6 +21,8 @@
 # Authors:
 #     Andrea Bolognani <abologna@redhat.com>
 
+from __future__ import print_function
+
 import sys
 
 COLUMNS = 80