update molecule README for CentOS 8 ansible host

Author: sjpb

.gitignore

@@ -1,3 +1,4 @@
 *.swp
 *.retry
 *.pyc
+venv

molecule/README.md

@@ -22,13 +22,16 @@ test11 | 1            | N                       | As for #5 but then deletes a n
 
 # Local Installation & Running
 
-Local installation on a Centos7 machine looks like:
+Local installation on a CentOS 8 machine looks like:
 
     sudo yum install -y gcc python3-pip python3-devel openssl-devel python3-libselinux
     sudo yum install -y yum-utils
     sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
     sudo yum install -y docker-ce docker-ce-cli containerd.io
-    pip3 install -r molecule/requirements.txt --user
+    python3 -m venv venv
+    . venv/bin/activate
+    pip install -U pip
+    pip install -r molecule/requirements.txt
 
     sudo systemctl start docker
     sudo usermod -aG docker ${USER}

molecule/requirements.txt

@@ -1,3 +1,3 @@
 pip
 setuptools
-molecule[docker,lint]
+molecule[docker,lint,ansible]