Merge pull request #130 from tirkarthi/fix-abc

Import ABC from collections.abc for Python 3.10 compatibility.

dtreeviz/models/shadow_decision_tree.py

@@ -1,5 +1,5 @@
 from abc import ABC, abstractmethod
-from collections import Sequence
+from collections.abc import Sequence
 from numbers import Number
 from typing import List, Tuple, Mapping