ssl证书报错

获取etf时报错：urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:997)>

`client.get_etf_codes_all()`

在bse文件最前面加了忽略：

```
import ssl
ssl._create_default_https_context = ssl._create_unverified_context
```