Cannot handle non-ascii rar file name.

[HinTak]

You don't need the actual rar file - just create an empty file with the name below would reproduce the bug:

>>> from unrar import rarfile
>>> rar = rarfile.RarFile("[字型][文鼎] 29套 字體.rar")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "unrar/rarfile.py", line 127, in __init__
    archive = unrarlib.RAROpenArchiveDataEx(filename, mode=mode)
  File "unrar/unrarlib.py", line 157, in __init__
    CmtBufSize=ctypes.sizeof(self.CmtBuf))
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe5 in position 1: ordinal not in range(128)
>>>