Added 4.5 section to readme

[KrehlK]

Added updated 4.5 sections in the read to ensure that the pre-commit module is downloaded as well as other dependencies

`
4.5 Ensure you've downloaded pre-commit and other dependencies

.. code-block:: bash
    pip install pre-commit
    poetry install --all-groups

`

[Jyyjy]

I removed some redundant lines. Big thanks for solving #56