Add a docker version print to CI

Signed-off-by: Daniel Nephin <dnephin@docker.com>

circle.yml

@@ -11,6 +11,8 @@ jobs:
           command: apk add -U git openssh
       - checkout
       - setup_remote_docker
+      - run:
+          command: docker version
       - run:
           name: "Lint"
           command: |