LogFileHandler does not support encoding

[mechworrior]

Currently LogFileHandler does not inherit the encoding attribute from RotatingFileHandler.
This is required to enable utf-8 characters in Logs.

[rahulporuri]

It will be good to confirm that all of the kwargs accepted by RotatingFileHandler are also accepted by the LogFileHandler and that they are passed through as necessary.

Ref https://docs.python.org/3.6/library/logging.handlers.html#rotatingfilehandler

[mdickinson]

This was fixed in #324.