The version of gprof2dot is too old

[mybsdc]

Hello author, I found a problem. When I use webgrind to generate images, it will prompt:
error on line 18 at column 98: Encoding error
But when I use the latest version of https://github.com/jrfonseca/gprof2dot to replace library/gprof2dot.py, it works fine.
Can you update it, thanks!