feat: update README and CHANGELOG to note new poetry-based packaging

CHANGELOG.md

 # Changelog
 
+## 0.0.4
+
+Added:
+
+- Repackaged using poetry.
+- Aligned code style with black and isort by means of pre-commit checks.
+
 ## 0.0.3
 
 Added:

README.md

@@ -8,6 +8,17 @@ This is a library which contains:
 * a set of permissions classes allowing the authentication information provided by the API Gateway
   to be used in authorization decisions throughout an API-based app,
 
+## Library developer quick start
+
+This library is packages using `poetry` and uses our [common Python CI
+pipeline](https://gitlab.developers.cam.ac.uk/uis/devops/continuous-delivery/ci-templates/-/blob/master/auto-devops/python.md).
+Make sue that `poetry` is installed and bootstrap your local environment via:
+
+```console
+$ poetry install
+$ poetry run pre-commit install
+```
+
 ## Required settings
 
 The following Django settings are required to allow this library to be used:

pyproject.toml

 [tool.poetry]
 name = "django-ucam-apigatewayauth"
-version = "0.0.3"
+version = "0.0.4"
 description = "A Django module allow auth based on the headers passed from the API Gateway"
 authors = ["DevOps Division, University Information Services, University of Cambridge <devops@uis.cam.ac.uk>"]
 license = "MIT"