Merge pull request #1324 from huyphan/patch-1

Fix bug of wrong file extension

lib/controller/controller.py

@@ -362,7 +362,7 @@ def get_output_extension(self):
         if options["output_format"] in ("plain", "simple"):
             return "txt"
 
-        return {options["output_format"]}
+        return options["output_format"]
 
     def setup_reports(self):
         """Create report file"""