Resolve "Upgrade logging library"

Closes #491 (closed)

include/core/utils/logging.h

@@ -34,14 +34,10 @@
 
 // spdlog include
 #include "spdlog/spdlog.h"
-#if SPDLOG_VER_MAJOR >= 1
 #include "spdlog/async.h"
 // enable the use of ostream operator<<
 #include "spdlog/fmt/ostr.h"
 #include "spdlog/sinks/stdout_color_sinks.h"
-#else
-#include "spdlog/fmt/bundled/ostream.h"
-#endif
 
 // Wolf includes
 #include "core/utils/singleton.h"