adjust poetry install instructions
@@ -15,7 +15,7 @@ Overview
* Clone the PyMedPhys git repo
* eg. ``git clone https://github.com/pymedphys/pymedphys.git``
-* Run ``poetry install`` within the root of the repo
+* Run ``poetry install -E dev`` within the root of the repo
* Run ``poetry run pre-commit install``
* `Install pandoc`_
