Version bump.

Author: chriskohlhoff

include/boost/asio/version.hpp

@@ -18,6 +18,6 @@
 // BOOST_ASIO_VERSION % 100 is the sub-minor version
 // BOOST_ASIO_VERSION / 100 % 1000 is the minor version
 // BOOST_ASIO_VERSION / 100000 is the major version
-#define BOOST_ASIO_VERSION 103002 // 1.30.2
+#define BOOST_ASIO_VERSION 103100 // 1.31.0
 
 #endif // BOOST_ASIO_VERSION_HPP