fix build on MacOS

see https://stackoverflow.com/a/32556992/1720894

src/client/client.cpp

@@ -919,10 +919,10 @@ void Client::ReceiveAll()
  }
  /*
  // Get current time
- auto now = std::chrono::high_resolution_clock::now();
+ auto now = std::chrono::sytem_clock::now();
 
  // Convert to a time_t object
- auto now_c = std::chrono::high_resolution_clock::to_time_t(now);
+ auto now_c = std::chrono::system_clock::to_time_t(now);
 
  // Convert to local time
  std::tm* now_tm = std::localtime(&now_c);
@@ -1935,10 +1935,10 @@ std::string Client::getInfo() {
  std::string info(lua_tolstring(L, lua_gettop(L), &str_len));
 
  // Get current time
- auto now = std::chrono::high_resolution_clock::now();
+ auto now = std::chrono::system_clock::now();
 
  // Convert to a time_t object
- auto now_c = std::chrono::high_resolution_clock::to_time_t(now);
+ auto now_c = std::chrono::system_clock::to_time_t(now);
 
  // Convert to local time
  std::tm* now_tm = std::localtime(&now_c);
@@ -1979,10 +1979,10 @@ float Client::getReward() {
  reward = (float)lua_tonumber(L, lua_gettop(L));
 
  // Get current time
- auto now = std::chrono::high_resolution_clock::now();
+ auto now = std::chrono::system_clock::now();
 
  // Convert to a time_t object
- auto now_c = std::chrono::high_resolution_clock::to_time_t(now);
+ auto now_c = std::chrono::system_clock::to_time_t(now);
 
  // Convert to local time
  std::tm* now_tm = std::localtime(&now_c);