Update prerequisites.md (#312)

dear-ore · web-flow · commit c6daa45ca6e8 · 2022-10-19T13:59:50.000Z
diff --git a/src/introduction/prerequisites.md b/src/introduction/prerequisites.md
@@ -52,7 +52,7 @@ environment:
 :name: installing-cwltool-with-pip-and-venv
 :caption: Installing `cwltool` with `pip` and `venv`.
 
-$ python -m venv venv
+$ python3 -m venv venv
 $ source venv/bin/activate
 $ (venv) pip install -U pip setuptools wheel
 $ (venv) pip install cwltool
