Fix quote issue

Author: bartTC

.github/workflows/push.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

CHANGES.rst

@@ -11,8 +11,15 @@ Change log
 
 - Change local development setup to use Poetry_.
 
+- Testsuite and code quality checks are done through Github Actions.
+
+- Code quality and formatting utilises ruff_.
+
+- Removed ``typing_extensions`` as a dependency, as it's no longer required with
+  having Python 3.9+ as a requirement.
 
 .. _Poetry: https://python-poetry.org
+.. _ruff: https://astral.sh/ruff
 
 
 7.4.2 (6 February 2023)

pyproject.toml

@@ -42,11 +42,12 @@ qr = 'qrcode.console_scripts:main'
 [tool.poetry.dependencies]
 python = "^3.9"
 colorama = {version = "*", platform = "win32"}
-pypng = "*"
+pypng = {version = "*", optional = true}
 pillow = {version = ">=9.1.0", optional = true}
 
 [tool.poetry.extras]
 pil = ["pillow"]
+png = ["pypng"]
 
 [tool.poetry.group.dev.dependencies]
 pytest = {version = "*"}