remove complicated pip install req's

README.md

@@ -26,9 +26,6 @@ In practice, *de novo* mutations are partitioned by $k$-mer context; for simplic
 
 All methods were written in Python 3.9.6, and the full list of dependencies is provided in `requirements.txt`.
 
-The `scikit-allel` package requires `numpy`, so I recommend installing dependencies with `xargs -L 1 pip install < requirements.txt`, rather than the standard `pip install -r requirements.txt`.
-This way, `numpy` will be installed prior to `scikit-allel`.
-
 > I recommend using [`pyenv`](https://github.com/pyenv/pyenv) and [`pyenv-virtualenv`](https://github.com/pyenv/pyenv-virtualenv) to manage Python environments.
 
 ## Reproducing analyses and figures from Sasani et al. (2023)