[release] Reminder: Master branch closes for the 1.75.0 beta THIS WEDNESDAY

From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2020-11-02 20:32:20

See the calendar here for more dates:
        https://www.boost.org/development/ <https://www.boost.org/development/>

The master branch will be re-opened after the beta release.

Thanks,
— The Boost Release Team