Account for deprecation of DiGraph._repr_svg_ in graphviz

Author: scarf005

.pre-commit-config.yaml

@@ -12,7 +12,7 @@ repos:
       - id: end-of-file-fixer
       - id: mixed-line-ending
   - repo: https://github.com/psf/black
-    rev: 22.1.0
+    rev: 22.3.0
     hooks:
       - id: black
   - repo: https://github.com/timothycrosley/isort

binarytree/__init__.py

@@ -508,8 +508,12 @@ def _repr_svg_(self) -> str:  # pragma: no cover
         .. _Jupyter notebooks: https://jupyter.org
         """
         try:
-            # noinspection PyProtectedMember
-            return str(self.graphviz()._repr_svg_())
+            try:
+                # noinspection PyProtectedMember
+                return str(self.graphviz()._repr_svg_())
+            except AttributeError:
+                # noinspection PyProtectedMember
+                return str(self.graphviz()._repr_image_svg_xml())
 
         except (SubprocessError, ExecutableNotFound, FileNotFoundError):
             return self.svg()