It's that time again!

On Wednesday, the master branch will be closed for adding new libraries.

Upcoming dates:

* 24-Oct: Boost 1.69.0 closed for new libraries and breaking changes

* 31-Oct: Boost 1.69.0 closed for major code changes

* 7-Nov: Boost 1.69.0 closed for beta

* 14-Nov: Boost 1.69.0 beta 1

* 5-Dec: Boost 1.69.0 closed for release

* 12-Dec: Boost 1.69.0 release

-- The Boost Release Team