[boost] VS 2017 15.6 released, _MSC_VER=1913...

Subject: [boost] VS 2017 15.6 released, _MSC_VER=1913...
From: Peter Dimov (lists_at_[hidden])
Date: 2018-03-06 23:40:16

... and Boost.Config once again warns:

1>c:\boost-git\develop\boost\config\compiler\visualc.hpp(349): note: Info: 
Boost.Config is older than your compiler version - probably nothing bad will 
happen - but you may wish to look for an updated Boost version. Define 
BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE to suppress this message.

Maybe we should display this only on 1920 and above, as I suggested last 
time? :-)