Update README.md

README.md

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 # Dataset Card for a-share-21
 
 ## Dataset Summary
-This is a daily candlestick dataset of A-share market, covering the period from January 1, 2021, to January 1, 2025.
+This is a daily candlestick dataset of A-share market, covering the period from January 1, 2021, to Feb 27, 2025.
 It is primarily intended for historical market data research and does not guarantee the frequency of updates for new data.  
-**Attention**: the prices are `前复权价`.
+**Attention**: the prices are `前复权价`. 包含“深交所”+“上交所”的股票。