"update = false" is more friendly

[xingren23]

i believe it is not nessery to check update everytime, it take much more time

[Nourepide]

A good point, but it's not worth disabling it at all, I suspect I need to make it possible to check updates once a day/week/month.

[Nourepide]

I changed the behavior in 45acea4.

The check_updates parameter has been renamed to update_frequency and now include:

• always - formerly true.
• never - formerly false.
• day - now by default.
• week - optional.
• month - optional.