Add file IO

app.py

@@ -27,7 +27,7 @@ def modernisa(lines=None, file_obj=None):
             output_file = "modernized.txt"
     with open(output_file, "w") as output:
         output.write("\n".join(generated_text))
-    return "<br/>".join(generated_text), output
+    return "<br/>".join(generated_text), output_file
 
 
 samples = [