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/client/crawl/http_crawl.cpp

@@ -168,7 +168,7 @@ public:
         , strand_(ios)
     {
         // Set up the common fields of the request
-        req_.version = 11;
+        req_.version(11);
         req_.method(http::verb::get);
         req_.target("/");
         req_.set(http::field::user_agent, BOOST_BEAST_VERSION_STRING);