Fixed pre-commit errors and updated black version.

README.rst

@@ -210,4 +210,4 @@ Periodically you should update conda and the required Python packages. With the
 Thanks To Our Contributors ✨🔗
 ==========================
 .. image:: https://contrib.rocks/image?repo=gprMax/gprMax
-   :target: https://github.com/gprMax/gprMax/graphs/contributors
+   :target: https://github.com/gprMax/gprMax/graphs/contributors