message::version is a member function (API Change):

fix #778

* The version data member is replaced with accessor
  member functions.

Actions Required:

* Call member function message::version instead of accessing
  the version member at call sites.

example/http/server/small/http_server_small.cpp

@@ -100,7 +100,7 @@ private:
     void
     process_request()
     {
-        response_.version = 11;
+        response_.version(11);
         response_.set(http::field::connection, "close");
 
         switch(request_.method())