feat: start using venv instead of virtualenv

Author: simonsdave

cfg4dev

@@ -5,12 +5,10 @@ export DEV_ENV_DOCKER_IMAGE=simonsdave/cloudfeaster-dev-env:build
 if [ -d ./env ]; then
     source ./env/bin/activate
 else
-    python3.7 -m pip install virtualenv
-
-    virtualenv env
+    python3 -m venv env
     source ./env/bin/activate
 
-    python3.7 -m pip install --upgrade pip
+    pip install --upgrade pip
 
     curl -s -L https://raw.githubusercontent.com/simonsdave/dev-env/master/bin/install-dev-env.sh | bash -s --