#6 update docker image to python 3.9

.circleci/config.yml

@@ -21,7 +21,7 @@ jobs:
     # The executor is the environment in which the steps below will be executed - below will use a python 3.8 container
     # Change the version below to your required version of python
     docker:
-      - image: cimg/python:2.7.18
+      - image: cimg/python:3.9
     # Checkout the code as the first step. This is a dedicated CircleCI step.
     # The python orb's install-packages step will install the dependencies from a Pipfile via Pipenv by default.
     # Here we're making sure we use just use the system-wide pip. By default it uses the project root's requirements.txt.