Display warning after arguments check

src/main.py

@@ -52,12 +52,13 @@ def main(files):
 
 
 if __name__ == '__main__':
-    print('WARNING')
-    print('All your sheets should have the same column order.\n')
     ap = argparse.ArgumentParser()
     ap.add_argument('-f', '--files', type=str, nargs='+', help='Files to upload.', required=True)
 
     args = ap.parse_args()
     files = args.files
+    
+    print('WARNING')
+    print('All your sheets should have the same column order.\n')
 
     main(files)