Merge pull request #12 from Trivernis/renovate/docker-circleci-python-3.x

Update circleci/python Docker tag to v3.7.2

.circleci/config.yml

@@ -8,7 +8,7 @@ jobs:
     docker:
       # specify the version you desire here
       # use `-browsers` prefix for selenium tests, e.g. `3.6.1-browsers`
-      - image: circleci/python:3.7.0b1
+      - image: circleci/python:3.7.2
 
       # Specify service dependencies here if necessary
       # CircleCI maintains a library of pre-built images