fix: move mypy config to pyproject file

Fixes #1.

README.md

@@ -43,9 +43,6 @@ modify the copyright blurb in the source files.
 
 ## 👷 2: TODO
 
-* [[#1](https://github.com/pyxy-dk/python-project-template/issues/1)]
-  Move [mypy] configuration into `pyproject.toml`
-  [once the functionality has stabilised](https://github.com/python/mypy/issues/5205#issuecomment-832779057).
 * [[#2](https://github.com/pyxy-dk/python-project-template/issues/2)] Ensure
   [pipx](https://pipxproject.github.io/pipx/) compatibility by setting up
   [flit entrypoints](https://flit.readthedocs.io/en/latest/pyproject_toml.html#scripts-section).

pyproject.toml

@@ -67,6 +67,21 @@ use_parentheses = true
 line_length = 99
 py_version = 37
 
+[tool.mypy]
+plugins = [
+  "numpy.typing.mypy_plugin",
+]
+python_version = "3.7"
+warn_return_any = true
+warn_unused_configs = true
+
+[[tool.mypy.overrides]]
+module = [
+  "pandapower.*",
+  "psycopg2",
+]
+ignore_missing_imports = true
+
 [tool.pytest.ini_options]
 minversion = "7.0"
 filterwarnings = "error::UserWarning"