Steps to reproduce

1. generate a new text file and rename like 测试.txt and copy as 111.txt

2. just send this two file
   import telegram
TGBot = telegram.Bot(TGBotToken)
TGBot.sendDocument(test_chatid, document=open('测试.txt', 'rb'))
TGBot.sendDocument(test_chatid, document=open('111.txt', 'rb'))

Expected behaviour

in the elder version (10.1.0) send file with Chinese charscter is success

Actual behaviour

/usr/local/lib/python3.5/dist-packages/telegram/bot.py in decorator(self, *args, **kwargs)
63 def decorator(self, *args, **kwargs):
64 logger.debug('Entering: %s', func.name)
---> 65 result = func(self, *args, **kwargs)
66 logger.debug(result)
67 logger.debug('Exiting: %s', func.name)

/usr/local/lib/python3.5/dist-packages/telegram/bot.py in decorator(self, *args, **kwargs)
88 data['reply_markup'] = reply_markup
89
---> 90 result = self._request.post(url, data, timeout=kwargs.get('timeout'))
91
92 if result is True:

/usr/local/lib/python3.5/dist-packages/telegram/utils/request.py in post(self, url, data, timeout)
303 # Use multipart upload if we're uploading files, otherwise use JSON
304 if files:
--> 305 result = self._request_wrapper('POST', url, fields=data, **urlopen_kwargs)
306 else:
307 result = self._request_wrapper('POST', url,

/usr/local/lib/python3.5/dist-packages/telegram/utils/request.py in _request_wrapper(self, *args, **kwargs)
221 raise Unauthorized(message)
222 elif resp.status == 400:
--> 223 raise BadRequest(message)
224 elif resp.status == 404:
225 raise InvalidToken()

BadRequest: Wrong remote file id specified: wrong character in the string

Configuration

Ubuntu 16.04
Python 3.5.2
two version are both failed
python-telegram-bot==11.0.0
python-telegram-bot==11.1.0

Logs

Insert logs here (if necessary)