Drop Python 3.5 support

Author: Bjwebb

.github/workflows/lint.yml

@@ -18,7 +18,6 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-pip-
     - run: pip install --upgrade -r requirements_dev.txt
-    - run: pip install black==19.10b0
     - run: black --check *.py */
     - run: isort --check-only *.py */
     - run: flake8

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.5', '3.6', '3.7', '3.8']
+        python-version: [ '3.6', '3.7', '3.8']
     steps:
     - uses: actions/checkout@v2
     - name: Setup python

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Removed
+
+- We no longer support Python 3.5
+
 ### Fixed
 
 - Don't fail when an .ods column header is empty https://github.com/OpenDataServices/flatten-tool/issues/378

docs/getting-started.rst

@@ -4,7 +4,7 @@ Getting Started
 Prerequisites
 -------------
 
-You will need Python 3.5 or later, including the venv module.
+You will need Python 3.6 or later, including the venv module.
 
 Generally the venv module should come with your default Python install, but not on Ubuntu.  On Ubuntu run:
 
@@ -41,9 +41,7 @@ will print help information specific to that sub-command.
 Python Version Support
 ----------------------
 
-This code supports Python 3.5 (and later).
+This code supports Python 3.6 (and later).
 
-Python 3.4 (and earlier Python 3 versions) is not supported, because one of the dependencies (openpyxl) does not
-support it.
-
-Python 2 is not supported because it is now end of life.
+Python 3.5 and earlier (including Python 2) are not supported, because they are
+end of life, and some of the dependencies do not support them.

requirements_dev.txt

@@ -8,4 +8,5 @@ sphinx
 sphinx_rtd_theme
 isort
 flake8
+black==19.10b0
 transifex-client