Adding Python 3.6 support for test & CI.

Author: madpah

.circleci/config.yml

@@ -15,6 +15,9 @@
 version: 2.1
 
 executors:
+  python36:
+    docker:
+      - image: circleci/python:3.6
   python37:
     docker:
       - image: circleci/python:3.7
@@ -87,6 +90,8 @@ workflows:
   version: 2
   build_and_test_and_publish:
     jobs:
+      - build:
+          executor: python36
       - build:
           executor: python37
       - build:
@@ -102,6 +107,8 @@ workflows:
             branches:
               only: main
     jobs:
+      - build:
+          executor: python36
       - build:
           executor: python37
       - build:

.github/workflows/poetry.yml

@@ -55,7 +55,7 @@ jobs:
           - "3.9" # highest supported
           - "3.8"
           - "3.7"
-#          - "3.6" # lowest supported
+          - "3.6" # lowest supported
     timeout-minutes: 30
     steps:
       - name: Checkout

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion=3.9.0
-envlist = flake8,py3.9,py3.8,py3.7
+envlist = flake8,py3.9,py3.8,py3.7,py3.6
 
 [testenv]
 deps =