Update config.yml

Author: gkorland

.circleci/config.yml

@@ -36,6 +36,10 @@ jobs:
             - ./venv
           key: v1-dependencies-{{ checksum "requirements.txt" }}
 
+      - run:
+          name: test dist
+          command: python setup.py sdist
+
       - run:
           name: run tests
           command: |
@@ -61,4 +65,4 @@ workflows:
               only:
                 - master
     jobs:
-      - build  
+      - build