Installing requirements into venv directory, caching it.

.circleci/config.yml

@@ -20,15 +20,17 @@ jobs:
     steps:
       - checkout
       - run:
-          command: "pip install -r requirements.txt"
+          name: Install Requirements
+          command: |
+            python3 -m venv venv
+            . venv/bin/activate
+            pip install -r requirements.txt
       - run:
           command: 'pytest -svv wrolpi modules'
       - save_cache:
           key: deps9-{{ .Branch }}-{{ checksum "Pipfile.lock" }}
           paths:
-            - ".venv"
-            - "/usr/local/bin"
-            - "/usr/local/lib/python3.6/site-packages"
+            - "venv"
 
 # Invoke jobs via workflows
 # See: https://circleci.com/docs/2.0/configuration-reference/#workflows