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fix remove mplfinance package in requirements.txt

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add stock_em_hsgt_hist interface

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fix get_dce_option_daily interface

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add stock_zh_index_daily_tx, bond_cov_jsl interface

add macro_china_fx_gold interface

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fix futures_daily_bar interface

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fix covid for python3.8

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add macro_china_new_financial_credit interface

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fix stock_em_account interface

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fix cot interface

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fix code format

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add index_stock_hist interface

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