Parsing log

[FormozaxXaw]

Hi.
In maillog have russian simbols. After pars, i have a problem

/postfix-parser$ ./run.sh parse
Loading .env environment variables…
2020-10-15 17:42:28,307 postfixparser.main INFO Importing log file
2020-10-15 17:42:28,307 postfixparser.main INFO Opening log file /var/log/mail.log
Traceback (most recent call last):
File "./manage.py", line 70, in
args.func(args)
File "./manage.py", line 56, in runparse
asyncio.run(main())
File "/usr/lib/python3.8/asyncio/runners.py", line 43, in run
return loop.run_until_complete(main)
File "/usr/lib/python3.8/asyncio/base_events.py", line 608, in run_until_complete
return future.result()
File "/home/mailparser/postfix-parser/postfixparser/main.py", line 96, in main
msgs = await import_log(settings.mail_log)
File "/home/mailparser/postfix-parser/postfixparser/main.py", line 74, in import_log
line = f.readline()
File "/usr/lib/python3.8/codecs.py", line 322, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb4 in position 7150: invalid start byte