[readme] Update README for version 2.3.x (#460)

Author: sea-bass

README.md

@@ -1,33 +1,32 @@
-# Py Trees
+# PyTrees
 
 [[About](#about)] [[What's New?](#whats-new)] [[Documentation](#documentation)] [[Getting Started](#getting-started)] [[Next Steps](#next-steps)] [[Releases](#releases)]
 
 ----
 
 ## About
 
-PyTrees is a python implementation of behaviour trees designed to facilitate the rapid development of medium sized decision making engines for use in fields like robotics. Brief feature list:
+PyTrees is a Python implementation of behaviour trees designed to facilitate the rapid development of medium sized decision making engines for use in fields like robotics.
+
+Brief feature list:
 
 * Behaviours, Decorators, Sequences, Selectors, Parallels and BehaviourTree.
 * Blackboards for data sharing.
-* A useful library of behaviours, decorators and idioms.
+* A useful library of behaviours, decorators, and idioms.
 * Serialise to a dot graph or render to ascii/unicode in a terminal.
 * Tested on Linux and Mac (YMMV with Windows).
 
 ## What's New?
 
-* [2023-01-28] The [2.2.x Release][new-2.2.x] is out! Sequences and Selectors with AND without memory.
-* [2023-01-28] [Get Started](#getting-started) with py_trees in under 5mins.
-* [2023-01-28] This is now a `poetry` project with configuration governed by `pyproject.toml`.
-  * The vestigial `setup.py` is only to assist distribution where [PEP-517](https://peps.python.org/pep-0517/) is not yet well supported.
+* [2025-01-11] Support for Python 3.12 was added, and Python 3.8 was dropped.
 
 ## Documentation
 
-[![devel][docs-devel-image]][docs-devel] [![2.2.x][docs-2.2.x-image]][docs-2.2.x] [![2.1.x][docs-2.1.x-image]][docs-2.1.x] [![0.7.x][docs-0.7.x-image]][docs-0.7.x] [![0.6.x][docs-0.6.x-image]][docs-0.6.x]
+[![devel][docs-devel-image]][docs-devel] [![2.3.x][docs-2.3.x-image]][docs-2.3.x] [![2.2.x][docs-2.2.x-image]][docs-2.2.x] [![2.1.x][docs-2.1.x-image]][docs-2.1.x]
 
 ## Getting Started
 
-You can get started on CodeSpaces (with no mismatched environment issues and in under 5mins) [1]:
+You can get started on Codespaces (with no mismatched environment issues and in under 5 minutes) [1]:
 
 1. Fork the project to your personal account
 2. Click on Code -> Codespaces -> + Create a Codespace
@@ -65,8 +64,8 @@ py310 py312 format check mypy310 mypy312
 # https://github.com/splintered-reality/py_trees/blob/devel/CONTRIBUTING.md
 ```
 
-[1] All of the above will, of course, work in a local environment if you have `poetry` installed. If you're using `VSCode`
-you don't even need that, just reopen the project in the [devcontainer](.devcontainer/devcontainer.json) and be froody.
+[1] All of the above will, of course, work in a local environment if you have `poetry` installed.
+If you're using `VSCode` you don't even need that, just reopen the project in the [devcontainer](.devcontainer/devcontainer.json) and be froody.
 
 ## Next Steps
 
@@ -75,7 +74,7 @@ On PyPi:
 * [py_trees_js](https://pypi.org/project/py-trees-js/)
 
 Examples:
-* [ReadTheDocs - PyTrees ROS Tutorials](https://py-trees-ros-tutorials.readthedocs.io/en/release-2.0.x/index.html) - significantly more edifying than the demos, these incrementally walk through the process of building a decision making layer for a robot. These use ROS2 (sparsely), but merely browsing should be enlightening regardless.
+* [ReadTheDocs - PyTrees ROS Tutorials](https://py-trees-ros-tutorials.readthedocs.io/en/devel/index.html) - significantly more edifying than the demos, these incrementally walk through the process of building a decision making layer for a robot. These use ROS2 (sparsely), but merely browsing should be enlightening regardless.
 
 Visualisation:
 * [py_trees_js](https://github.com/splintered-reality/py_trees_js) - a javascript library for building your own runtime visualisation tool
@@ -86,6 +85,7 @@ Robotics:
 
 ## Releases
 
+* `2.3.x` - Support for Python 3.12 was added, and Python 3.8 was dropped.
 * `2.2.x` - Selectors, Sequences with and without memory. Improved testing and style/type checking.
 * `2.1.x` - Chooser deprecated. API housekeeping.
 * `2.0.x` - Blackboards V2!
@@ -94,12 +94,12 @@ Robotics:
 * `1.0.x` - Behaviours, Decorators, Composites, Blackboards, Tree Management and Viz tools.
 * `0.y.x` - First open source pre-releases.
 
-| | Devel | 2.2.x | 2.1.x | 2.0.x | 1.2.x | 0.7.x | 0.6.x |
-|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
-| Sources | [![devel][sources-devel-image]][sources-devel] | [![2.1.x][sources-2.2.x-image]][sources-2.2.x] | [![2.1.x][sources-2.1.x-image]][sources-2.1.x] | [![2.0.x][sources-2.0.x-image]][sources-2.0.x] | [![1.2.x][sources-1.2.x-image]][sources-1.2.x] | [![0.7.x][sources-0.7.x-image]][sources-0.7.x] | [![0.6.x][sources-0.6.x-image]][sources-0.6.x]
-| Compatibility | [![Python 3.12][python312-image]][python312-docs] [![Python 3.10][python310-image]][python310-docs] | [![Python 3.10][python310-image]][python310-docs] [![Python 3.8][python38-image]][python38-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 2.7][python27-image]][python27-docs]
-| CI | [![devel-Status][devel-build-status-image]][devel-build-status] | [![2.2.x-Status][2.2.x-build-status-image]][2.2.x-build-status] | - | - | - | - | - | 
-| Documentation | [![devel-Docs][rtd-devel-image]][docs-devel] | [![2.2.x-Docs][rtd-2.2.x-image]][docs-2.2.x] | [![2.1.x-Docs][rtd-2.1.x-image]][docs-2.1.x] | [![2.0.x-Docs][rtd-2.0.x-image]][docs-2.0.x] | [![1.2.x-Docs][rtd-1.2.x-image]][docs-1.2.x] | [![0.7.x-Docs][rtd-0.7.x-image]][docs-0.7.x] | [![0.6.x-Docs][rtd-0.6.x-image]][docs-0.6.x]
+| | Devel | 2.3.x | 2.2.x | 2.1.x | 2.0.x | 1.2.x |
+|:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| Sources | [![devel][sources-devel-image]][sources-devel] | [![2.3.x][sources-2.3.x-image]][sources-2.3.x] | [![2.2.x][sources-2.2.x-image]][sources-2.2.x] | [![2.1.x][sources-2.1.x-image]][sources-2.1.x] | [![2.0.x][sources-2.0.x-image]][sources-2.0.x] | [![1.2.x][sources-1.2.x-image]][sources-1.2.x] |
+| Compatibility | [![Python 3.12][python312-image]][python312-docs]<br/>[![Python 3.10][python310-image]][python310-docs] | [![Python 3.12][python312-image]][python312-docs]<br/>[![Python 3.10][python310-image]][python310-docs] | [![Python 3.10][python310-image]][python310-docs]<br/>[![Python 3.8][python38-image]][python38-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] | [![Python 3.6][python36-image]][python36-docs] |
+| CI | [![devel-Status][devel-build-status-image]][devel-build-status] | [![2.3.x-Status][2.3.x-build-status-image]][2.3.x-build-status] | [![2.2.x-Status][2.2.x-build-status-image]][2.2.x-build-status] | - | - | - | - | - |
+| Documentation | [![devel-Docs][rtd-devel-image]][docs-devel] | [![2.3.x-Docs][rtd-2.3.x-image]][docs-2.3.x] | [![2.2.x-Docs][rtd-2.2.x-image]][docs-2.2.x] | [![2.1.x-Docs][rtd-2.1.x-image]][docs-2.1.x] | [![2.0.x-Docs][rtd-2.0.x-image]][docs-2.0.x] | [![1.2.x-Docs][rtd-1.2.x-image]][docs-1.2.x] |
 
 
 [license-image]: https://img.shields.io/badge/License-BSD%203--Clause-orange.svg?style=plastic
@@ -113,18 +113,16 @@ Robotics:
 [python38-docs]: https://docs.python.org/3.8/
 [python36-image]: https://img.shields.io/badge/python-3.6-green.svg?style=plastic
 [python36-docs]: https://docs.python.org/3.6/
-[python27-image]: https://img.shields.io/badge/python-2.7-green.svg?style=plastic
-[python27-docs]: https://docs.python.org/2.7/
 
 [devel-build-status-image]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml/badge.svg
 [devel-build-status]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml
+[2.3.x-build-status-image]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml/badge.svg??branch=release/2.3.x
+[2.3.x-build-status]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml
 [2.2.x-build-status-image]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml/badge.svg??branch=release/2.2.x
 [2.2.x-build-status]: https://github.com/splintered-reality/py_trees/actions/workflows/pre-merge.yaml
 
-[new-2.2.x]: https://github.com/splintered-reality/py_trees/blob/devel/CHANGELOG.rst#22x-2023-01-23---sequences-and-selectors-with-and-without-memory
-
-
 [docs-devel]: http://py-trees.readthedocs.io/
+[docs-2.3.x]: http://py-trees.readthedocs.io/en/release-2.3.x/
 [docs-2.2.x]: http://py-trees.readthedocs.io/en/release-2.2.x/
 [docs-2.1.x]: http://py-trees.readthedocs.io/en/release-2.1.x/
 [docs-2.0.x]: http://py-trees.readthedocs.io/en/release-2.0.x/
@@ -135,6 +133,7 @@ Robotics:
 [docs-0.5.x]: http://docs.ros.org/kinetic/api/py_trees/html/
 
 [docs-devel-image]: http://img.shields.io/badge/docs-devel-brightgreen.svg?style=plastic
+[docs-2.3.x-image]: http://img.shields.io/badge/docs-2.3.x-brightgreen.svg?style=plastic
 [docs-2.2.x-image]: http://img.shields.io/badge/docs-2.2.x-brightgreen.svg?style=plastic
 [docs-2.1.x-image]: http://img.shields.io/badge/docs-2.1.x-brightgreen.svg?style=plastic
 [docs-2.0.x-image]: http://img.shields.io/badge/docs-2.0.x-brightgreen.svg?style=plastic
@@ -145,6 +144,7 @@ Robotics:
 [docs-0.5.x-image]: http://img.shields.io/badge/docs-0.5.x-brightgreen.svg?style=plastic
 
 [rtd-devel-image]: https://readthedocs.org/projects/py-trees/badge/?version=devel&style=plastic
+[rtd-2.3.x-image]: https://readthedocs.org/projects/py-trees/badge/?version=release-2.3.x&style=plastic
 [rtd-2.2.x-image]: https://readthedocs.org/projects/py-trees/badge/?version=release-2.2.x&style=plastic
 [rtd-2.1.x-image]: https://readthedocs.org/projects/py-trees/badge/?version=release-2.1.x&style=plastic
 [rtd-2.0.x-image]: https://readthedocs.org/projects/py-trees/badge/?version=release-2.0.x&style=plastic
@@ -156,6 +156,7 @@ Robotics:
 [not-available-docs-image]: http://img.shields.io/badge/docs-n/a-yellow.svg?style=plastic
 
 [sources-devel]: https://github.com/splintered-reality/py_trees/tree/devel
+[sources-2.3.x]: https://github.com/splintered-reality/py_trees/tree/release/2.3.x
 [sources-2.2.x]: https://github.com/splintered-reality/py_trees/tree/release/2.2.x
 [sources-2.1.x]: https://github.com/splintered-reality/py_trees/tree/release/2.1.x
 [sources-2.0.x]: https://github.com/splintered-reality/py_trees/tree/release/2.0.x
@@ -166,6 +167,7 @@ Robotics:
 [sources-0.5.x]: https://github.com/splintered-reality/py_trees/tree/release/0.5.x
 
 [sources-devel-image]: http://img.shields.io/badge/sources-devel-blue.svg?style=plastic
+[sources-2.3.x-image]: http://img.shields.io/badge/sources-2.3.x-blue.svg?style=plastic
 [sources-2.2.x-image]: http://img.shields.io/badge/sources-2.2.x-blue.svg?style=plastic
 [sources-2.1.x-image]: http://img.shields.io/badge/sources-2.1.x-blue.svg?style=plastic
 [sources-2.0.x-image]: http://img.shields.io/badge/sources-2.0.x-blue.svg?style=plastic