Adding a log line to make sure time_since_epoch works

src/server.cpp

@@ -64,6 +64,7 @@ namespace ball_tracking {
       void start_server(const json& conf) {
         if (conf.count("log")) set_log_config(conf.at("log"));
         start_time = high_resolution_clock::now();
+        BOOST_LOG_TRIVIAL(info) << "Tracking server started at time " << start_time.time_since_epoch().count();
 
         //1) Start the networking sockets
         const json& srv_conf = conf.at("servers");