Update main.cpp (wang-xinyu#1167)

Author: zeyad-mansour

yolov7/main.cpp

@@ -1,11 +1,12 @@
-#include "config.h"
+#include "config.h"
 #include "model.h"
 #include "cuda_utils.h"
 #include "logging.h"
 #include "utils.h"
 #include "preprocess.h"
 #include "postprocess.h"
 #include <chrono>
+#include <fstream>
 
 using namespace nvinfer1;