Resolve "Create a rule that gets the construction date from cadaster data for Tabula dataset."

Closes #20 (closed)

\approve @ds @laurens @chengzhi

building/02_process/tabula/date_from_valencian_cadaster/date_from_valencian_cadaster.py

@@ -18,9 +18,9 @@ from rulelib import AbstractRule
 
 
 class DateFromValencianCadasterRule(AbstractRule):
-    from databaselib import AbstractDatabase
+    from databaselib import PostGISDatabase
 
-    def __call__(self, database: AbstractDatabase, geometry: str, *args, **kwargs):
+    def __call__(self, database: PostGISDatabase, geometry: str, *args, **kwargs):
         """
         A building's geometry is tested for intersection with a cadastral parcel in the source
         database, if there is cadaster data for this location. There is currently only