[boost] Heads up - Release branch closed as of tomorrow

Starting tomorrow (Monday, June 27), the release branch will be closed, except by permission from the release managers. -- Marshall Marshall Clow Idio Software mailto:mclow.lists@gmail.com A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki