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Update README.md

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@@ -136,17 +136,11 @@ Also, users can install the latest dev version ``Qlib`` by the source code accor
```
* Clone the repository and install ``Qlib`` as follows.
* If you haven't installed qlib by the command ``pip install pyqlib`` before:
```bash
git clone https://github.com/microsoft/qlib.git && cd qlib
python setup.py install
```
* If you have already installed the stable version by the command ``pip install pyqlib``:
```bash
git clone https://github.com/microsoft/qlib.git && cd qlib
pip install .
```
**Note**: **Only** the command ``pip install .`` **can** overwrite the stable version installed by ``pip install pyqlib``, while the command ``python setup.py install`` **can't**.
**Note**: You can install Qlib with `python setup.py install` as well. But it is not the recommanded approach. It will skip `pip` and cause obscure problems. For example, **only** the command ``pip install .`` **can** overwrite the stable version installed by ``pip install pyqlib``, while the command ``python setup.py install`` **can't**.
**Tips**: If you fail to install `Qlib` or run the examples in your environment, comparing your steps and the [CI workflow](.github/workflows/test.yml) may help you find the problem.