Fix to work with commit 1e4717e (#681)

Author: garethsb

Release/src/http/listener/http_server_asio.cpp

@@ -659,7 +659,7 @@ will_deref_and_erase_t asio_server_connection::handle_http_line(const boost::sys
         std::string http_version = http_path_and_version.substr(http_path_and_version.size() - VersionPortionSize + 1, VersionPortionSize - 2);
 
         auto m_request_impl = m_request._get_impl().get();
-        web::http::http_version parsed_version = web::http::http_version::from_string(utility::conversions::to_string_t(http_version));
+        web::http::http_version parsed_version = web::http::http_version::from_string(http_version);
         m_request_impl->_set_http_version(parsed_version);
 
         // if HTTP version is 1.0 then disable pipelining