Fix black version in developers.rst
@@ -10,7 +10,7 @@ This document describes the process and conventions to follow when
developing RDFLib code.
* Please be as Pythonic as possible (:pep:`8`).
-* Code should be formatted using `black <https://github.com/psf/black>`_ and we use Black v21.9b0, with the black config in ``pyproject.toml``.
+* Code should be formatted using `black <https://github.com/psf/black>`_ and we use Black v22.1.0, with the black config in ``pyproject.toml``.
* Code should also pass `flake8 <https://github.com/psf/black>`_ linting
and `mypy <http://mypy-lang.org/>`_ type checking.
* You must supply tests for new code
