Update README.md (#1839)

Update data example to 20240809

Author: shenguanjiejie

README.md

@@ -177,11 +177,11 @@ Also, users can install the latest dev version ``Qlib`` by the source code accor
 
 ## Data Preparation
 ❗ Due to more restrict data security policy. The offical dataset is disabled temporarily. You can try [this data source](https://github.com/chenditc/investment_data/releases) contributed by the community.
-Here is an example to download the data updated on 20220720.
+Here is an example to download the data updated on 20240809.
 ```bash
-wget https://github.com/chenditc/investment_data/releases/download/20220720/qlib_bin.tar.gz
+wget https://github.com/chenditc/investment_data/releases/download/2024-08-09/qlib_bin.tar.gz
 mkdir -p ~/.qlib/qlib_data/cn_data
-tar -zxvf qlib_bin.tar.gz -C ~/.qlib/qlib_data/cn_data --strip-components=2
+tar -zxvf qlib_bin.tar.gz -C ~/.qlib/qlib_data/cn_data --strip-components=1
 rm -f qlib_bin.tar.gz
 ```