don't use pluggy, but entrypoints directly

datetimetype/__init__.py

@@ -1,6 +1,5 @@
 import numpy as np
 from datetime_distance import DateTimeComparator
-from dedupe.hookspecs import hookimpl
 from dedupe.variables.base import DerivedType, FieldType
 from dedupe.variables.string import affineGap
 
@@ -113,8 +112,3 @@ def comparator(self, field_1, field_2):
         distances[1 : len(comparisons) + 1] = comparisons
 
         return distances
-
-
-@hookimpl
-def register_variable():
-    return {DateTimeType.type: DateTimeType}

pyproject.toml

@@ -13,7 +13,7 @@ dependencies = ["dedupe>=3.0", "datetime-distance"]
 Homepage = "https://github.com/datamade/dedupe-variable-datetime"
 
 [project.entry-points]
-dedupe = {datetimetype = "datetimetype"}
+dedupevariables = {datetimetype = "datetimetype:DateTimeType"}
 
 [tool.setuptools]
 packages = ["datetimetype"]