cqlsh crashes if it load a utf-8 file.

$cat ./test.cql
// 日本語のコメント
use system;
select * from system.peers;

$cqlsh --version
cqlsh 5.0.1

$cqlsh -f ./test.cql
Traceback (most recent call last):
  File "./cqlsh", line 2459, in <module>
    main(*read_options(sys.argv[1:], os.environ))
  File "./cqlsh", line 2451, in main
    shell.cmdloop()
  File "./cqlsh", line 940, in cmdloop
    line = self.get_input_line(self.prompt)
  File "./cqlsh", line 909, in get_input_line
    self.lastcmd = self.stdin.readline()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/codecs.py", line 675, in readline
    return self.reader.readline(size)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/codecs.py", line 530, in readline
    data = self.read(readsize, firstline=True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/codecs.py", line 477, in read
    newchars, decodedbytes = self.decode(data, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe6 in position 3: ordinal not in range(128)