Add twine to workflow

Author: Pithikos

.circleci/config.yml

@@ -25,6 +25,10 @@ jobs:
     steps:
       - checkout
       - python/load-cache
+      - run:
+          name: install twine
+          command: |
+            sudo pip install twine
       - run:
           name: verify git tag vs. version
           command: |