text: Title: 使用configparser读取.ini配置文件，在部署时报错
  Body: 在Scrapy的settings文件中使用configparser读取.ini配置文件，
  ```
  config = RawConfigParser()
  config_file = os.getcwd() + '/config.ini'
  config.read(config_file)
  env = config['env']['env']
  ```
  
  在gerapy中部署时报错，报错信息如下：
  
  ```
    File "<frozen importlib._bootstrap>", line 994, in _gcd_import
    File "<frozen importlib._bootstrap>", line 971, in _find_and_load
    File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
    File "<frozen importlib._bootstrap>", line 656, in _load_unlocked
    File "<frozen importlib._bootstrap>", line 626, in _load_backward_compatible
    File "/tmp/douyin-1581320692-ek4kqmnm.egg/douyin/settings.py", line 38, in <module>
    File "/root/.pyenv/versions/3.6.7/lib/python3.6/configparser.py", line 959, in __getitem__
      raise KeyError(key)
  KeyError: 'env'
  ```
  