py_trees.display.render_dot_tree can't render Chinese

[Darley-Wey]

File "C:\Users\Darley\miniconda3\envs\antisubmarine\lib\site-packages\py_trees\display.py", line 661, in render_dot_tree
writer(pathname)
File "C:\Users\Darley\miniconda3\envs\antisubmarine\lib\site-packages\pydot\core.py", line 1660, in write
f.write(s)
UnicodeEncodeError: 'gbk' codec can't encode character '\u24c2' in position 289: illegal multibyte sequence