Update spdlog.cpp

src/spdlog.cpp

@@ -16,4 +16,5 @@
 #include "spdlog/logger-inl.h"
 #include "spdlog/sinks/sink-inl.h"
  
+// template instantiate logger with sinks init list
 template spdlog::logger::logger(std::string name, sinks_init_list::iterator begin, sinks_init_list::iterator end);