chore: clean packaging validation and config model

stw_potsdam/config.py

@@ -4,11 +4,20 @@ import configparser
 import io
 import os
 
-from collections import namedtuple
+from dataclasses import dataclass
 from functools import partial
 
-Canteen = namedtuple('Canteen',
-                     ('key', 'name', 'street', 'city', 'id', 'chash'))
+
+@dataclass(frozen=True)
+class Canteen:
+    """Configured OpenMensa canteen mapping."""
+
+    key: str
+    name: str
+    street: str
+    city: str
+    id: str
+    chash: str
 
 
 def _get_config(filename):