UnicodeDecodeError happens if unicode is not used

[kmyk]

Japanese users on Windows may use CP932 and get this error

INFO:onlinejudge_verify.main:generate documents...
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.8.2/x64/bin/oj-verify", line 8, in <module>
    sys.exit(main())
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/main.py", line 209, in main
    subcommand_docs()
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/main.py", line 157, in subcommand_docs
    onlinejudge_verify.docs.main()
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 730, in main
    PagesBuilder(cpp_source_pathstr='.', config=config)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 472, in __init__
    self.library_files = self.get_files(cpp_source_path, ignored_files=self.verify_files)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 535, in get_files
    if not self.is_ignored(path):
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 520, in is_ignored
    parser = FileParser(file_path)
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 47, in __init__
    self.lines = [line.decode().strip() for line in f.readlines()]
  File "/opt/hostedtoolcache/Python/3.8.2/x64/lib/python3.8/site-packages/onlinejudge_verify/docs.py", line 47, in <listcomp>
    self.lines = [line.decode().strip() for line in f.readlines()]
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x82 in position 37: invalid start byte
##[error]Process completed with exit code 1.

https://github.com/null0124/CompetitiveProgramming/runs/668146062