fix: Keep compatible with old boost versions (#444)

Author: erobot

lib/ClientConnection.cc

@@ -172,7 +172,13 @@ ClientConnection::ClientConnection(const std::string& logicalAddress, const std:
       executor_(executor),
       resolver_(executor_->createTcpResolver()),
       socket_(executor_->createSocket()),
+#if defined(USE_ASIO) || BOOST_VERSION >= 107000
       strand_(ASIO::make_strand(executor_->getIOService().get_executor())),
+#elif BOOST_VERSION >= 106600
+      strand_(executor_->getIOService().get_executor()),
+#else
+      strand_(executor_->getIOService()),
+#endif
       logicalAddress_(logicalAddress),
       physicalAddress_(physicalAddress),
       cnxString_("[<none> -> " + physicalAddress + "] "),