'＊' suffix of the date is not handled

[ianlini]

symbol: 00694B
date: 106/06/08
eror message:

...
  File ".../python3.6/site-packages/twstock/stock.py", line 152, in fetch
    self.raw_data = [self.fetcher.fetch(year, month, self.sid)]
  File ".../python3.6/site-packages/twstock/stock.py", line 108, in fetch
    data['data'] = self.purify(data)
  File ".../python3.6/site-packages/twstock/stock.py", line 128, in purify
    return [self._make_datatuple(d) for d in original_data['aaData']]
  File ".../python3.6/site-packages/twstock/stock.py", line 128, in <listcomp>
    return [self._make_datatuple(d) for d in original_data['aaData']]
  File ".../python3.6/site-packages/twstock/stock.py", line 116, in _make_datatuple
    data[0] = datetime.datetime.strptime(self._convert_date(data[0]), '%Y/%m/%d')
  File "/usr/local/lib/python3.6/_strptime.py", line 565, in _strptime_datetime
    tt, fraction = _strptime(data_string, format)
  File "/usr/local/lib/python3.6/_strptime.py", line 365, in _strptime
    data_string[found.end():])
ValueError: unconverted data remains: ＊

The reason why there is ＊:

「＊」表示該日為該股票上櫃掛牌首日，其掛牌首日之漲跌係以當日收盤價減承銷價計算而得。

We should ignore this suffix.