Bump to 1.68.0

Jamroot

@@ -137,7 +137,7 @@ import threadapi-feature ;
 import option ;
 
 path-constant BOOST_ROOT : . ;
-constant BOOST_VERSION : 1.67.0 ;
+constant BOOST_VERSION : 1.66.0 ;
 constant BOOST_JAMROOT_MODULE : $(__name__) ;
 
 boostcpp.set-version $(BOOST_VERSION) ;

more/getting_started/detail/release-variables.rst

@@ -5,8 +5,8 @@
 .. This file contains all the definitions that need to be updated
 .. for each new release of Boost.
 
-.. |boost-version-number| replace:: 67
-.. |boost_ver| replace:: ``boost_1_67_0``
-.. |boost_ver-bold| replace:: **boost_1_67_0**
+.. |boost-version-number| replace:: 68
+.. |boost_ver| replace:: ``boost_1_68_0``
+.. |boost_ver-bold| replace:: **boost_1_68_0**
 
-.. _sf-download: http://www.boost.org/users/history/version_1_67_0.html
+.. _sf-download: http://www.boost.org/users/history/version_1_68_0.html