Drop support for Python 3.6

Python 3.6 was EOL on 23 Dec 2021.

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
       PIPENV_VENV_IN_PROJECT: enabled
     strategy:
       matrix:
-        python-version: [ '3.6', '3.7', '3.8', '3.9', '3.10' ]
+        python-version: [ '3.7', '3.8', '3.9', '3.10' ]
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python ${{ matrix.python-version }}

docs/contributing/development-environment.md

@@ -7,7 +7,7 @@ information and steps below to set up a local development environment for Baby B
 
 ## Requirements
 
-- Python 3.6+, pip, pipenv
+- Python 3.7+, pip, pipenv
 - NodeJS 16.x and NPM 8.x (NVM recommended)
 - Gulp
 - Possibly `libpq-dev`

docs/setup/deployment.md

@@ -71,7 +71,7 @@ requirements are Python, a web server, an application server, and a database.
 
 ### Requirements
 
-- Python 3.6+, pip, pipenv
+- Python 3.7+, pip, pipenv
 - Web server ([nginx](http://nginx.org/), [Apache](http://httpd.apache.org/), etc.)
 - Application server ([uwsgi](http://projects.unbit.it/uwsgi), [gunicorn](http://gunicorn.org/), etc.)
 - Database ([sqlite](https://sqlite.org/), [Postgres](https://www.postgresql.org/), [MySQL](https://www.mysql.com/), etc.)