using simple filesink in spdlog bench

bench/spdlog-bench-mt.cpp

@@ -4,7 +4,7 @@
 
 #include "spdlog/spdlog.h"
 
-#include <iostream>
+
 using namespace std;
 
 int main(int argc, char* argv[])
@@ -17,8 +17,8 @@ int main(int argc, char* argv[])
     int howmany = 1000000;
 
     namespace spd = spdlog;
-    ///Create a file rotating logger with 10mb size max and 5 rotated files
-    auto logger = spd::rotating_logger_mt("file_logger", "logs/spd-sample", 10 *1024 * 1024 , 5, false);
+
+    auto logger = spdlog::create<spd::sinks::simple_file_sink_mt>("file_logger", "logs/spd-bench-mt.txt", false);
 
     logger->set_pattern("[%Y-%b-%d %T.%e]: %v");