Hello, when using the Alphavantage api Chinese stock market data, it shows that the download failed. I think that the software can't get the data may be caused by the wrong stock code.

For example, Ping An Bank, the correct stock code is: 000001.SZ, but it is displayed as: 1.SZ in the software, which may cause the download to fail.

If the URL parameter "symbol=1.SZ" in the error message is changed to "symbol=000001.SZ"
, then the data can be downloaded.

I hope this bug will be fixed, thank you very much

Hello, the new version loses a lot of Chinese stock market indices, such as the Shanghai Composite Index and many other important data, and the stock code also has problems, such as Ping An Bank Co., Ltd. The stock code is: "000001.SZ", but in the new version of the software in September It is only displayed as "1.SZ", for example, the Shanghai Composite Index sse cannot be found at all in the new version. The previous version did not have this problem. Hope you can fix this, thank you very much.

The old version is fine 
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The new version has no data OR incorrect code
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