Update convert.py

x2paddle/convert.py

-## Copyright (c) 2020  PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2020  PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License"
 # you may not use this file except in compliance with the License.
@@ -312,4 +312,4 @@ def main():
 
 
 if __name__ == "__main__":
-    main()
\ No newline at end of file
+    main()