Update contributor, devel, and roadmap documentation

README.md

@@ -479,9 +479,11 @@ the [`--require-poetry`](#--require-poetry) option.
 
 ## Developing
 
-This project requires a developer to have Poetry version 1.0+ installed on their workstation, see
+This project requires Poetry version 1.0+ on the development workstation, see
 the [installation instructions here](https://python-poetry.org/docs/#installation).
 
+Local environment setup instructions:
+
 ```bash
 # Clone the repository...
 # ...over HTTPS
@@ -491,7 +493,7 @@ git clone git@github.com:enpaul/tox-poetry-installer.git
 
 # Create a the local project virtual environment and install dependencies
 cd tox-poetry-installer
-poetry install
+poetry install -E poetry
 
 # Install pre-commit hooks
 poetry run pre-commit install
@@ -500,11 +502,18 @@ poetry run pre-commit install
 poetry run tox
 ```
 
+**NOTE:** Because the pre-commit hooks require dependencies in the Poetry environment it
+is recommend to [launch an environment shell](https://python-poetry.org/docs/cli/#shell)
+when developing the project. Alternatively, many `git` commands will need to be run from
+outside of the environment shell by prefacing the command with
+[`poetry run`](https://python-poetry.org/docs/cli/#run).
+
 
 ## Contributing
 
 All project contributors and participants are expected to adhere to the
-[Contributor Covenant Code of Conduct, Version 2](CODE_OF_CONDUCT.md).
+[Contributor Covenant Code of Conduct, v2](CODE_OF_CONDUCT.md)
+([external link](https://www.contributor-covenant.org/version/2/0/code_of_conduct/)).
 
 The `devel` branch has the latest (potentially unstable) changes. The
 [tagged versions](https://github.com/enpaul/tox-poetry-installer/releases) correspond to the
@@ -537,24 +546,25 @@ for usage in production environments.
       Tox configuration option ([#4](https://github.com/enpaul/tox-poetry-installer/issues/4))
 - [X] Add per-environment Tox configuration option to fall back to default installation
       backend.
-- [ ] Add warnings when an unsupported Tox configuration option is detected while using the
-      Poetry backend. ([#5](https://github.com/enpaul/tox-poetry-installer/issues/5))
+- [ ] ~Add warnings when an unsupported Tox configuration option is detected while using the
+      Poetry backend. ([#5](https://github.com/enpaul/tox-poetry-installer/issues/5))~
 - [X] Add trivial tests to ensure the project metadata is consistent between the pyproject.toml
       and the module constants.
 - [X] Update to use [poetry-core](https://github.com/python-poetry/poetry-core) and
       improve robustness of the Tox and Poetry module imports
       to avoid potentially breaking API changes in upstream packages. ([#2](https://github.com/enpaul/tox-poetry-installer/issues/2))
-- [ ] Find and implement a way to mitigate the [UNSAFE_DEPENDENCIES issue](https://github.com/python-poetry/poetry/issues/1584) in Poetry.
-      ([#6](https://github.com/enpaul/tox-poetry-installer/issues/6))
-- [ ] Fix logging to make proper use of Tox's logging reporter infrastructure ([#3](https://github.com/enpaul/tox-poetry-installer/issues/3))
+- [ ] ~Find and implement a way to mitigate the [UNSAFE_DEPENDENCIES issue](https://github.com/python-poetry/poetry/issues/1584) in Poetry.
+      ([#6](https://github.com/enpaul/tox-poetry-installer/issues/6))~
+- [X] Fix logging to make proper use of Tox's logging reporter infrastructure ([#3](https://github.com/enpaul/tox-poetry-installer/issues/3))
 - [X] Add configuration option for installing all dev-dependencies to a testenv ([#14](https://github.com/enpaul/tox-poetry-installer/issues/14))
 
 ### Path to Stable
 
 Everything in Beta plus...
 
-- [ ] Add tests for each feature version of Tox between 2.3 and 3.20
-- [ ] Add tests for Python-3.6, 3.7, and 3.8
+- [ ] Add comprehensive unit tests
+- [ ] Add tests for each feature version of Tox between 3.0 and 3.20
+- [ ] Add tests for Python-3.6, 3.7, 3.8, and 3.9
 - [X] Add Github Actions based CI
 - [ ] Add CI for CPython, PyPy, and Conda
 - [ ] Add CI for Linux and Windows