Add encoding='utf-8' to open()

[kuraha4]

My environment:
Windows 10 (Japanese system locale), Inkscape 1.01

Problem:
When I run the extension in Inkscape, generator.py throws an error like this:

Traceback (most recent call last):
  File "generator.py", line 382, in <module>
    globaldata.template = f.read()
UnicodeDecodeError: 'cp932' codec can't decode byte 0x89 in position 616: illegal multibyte sequence

Solution:
Added encoding='utf-8' argument to open() and the extension worked fine for me.

FYI, this section of the doc has an example in regards to the system default encoding.
https://docs.python.org/3/library/csv.html#examples