[py3] Fixed file.read().decode(), used codecs.open() instead

from __future__ import unicode_literals

import codecs

import os

import re

                 os.path.join(app_dir, "%s.sql" % opts.object_name.lower())]

    for sql_file in sql_files:

        if os.path.exists(sql_file):

            with open(sql_file, 'U') as fp:

            with codecs.open(sql_file, 'U', encoding=settings.FILE_CHARSET) as fp:

                # Some backends can't execute more than one SQL statement at a time,

                # so split into separate statements.

                output.extend(_split_statements(fp.read().decode(settings.FILE_CHARSET)))

                output.extend(_split_statements(fp.read()))

    return output