Add reno

Author: edoaltamura

releasenotes/notes/serializable-model-update-io-b708094e41edeb35.yaml

@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    Added new methods :meth:`to_dill` and :meth:`from_dill`, with improved docstrings and examples.
+    Deprecated :meth:`save` and :meth:`load` in favor of the `{to/from}_dill`.
+deprecations:
+  - |
+    The methods :meth:`SerializableModelMixin.save` and :meth:`SerializableModelMixin.load` have
+    been deprecated and will be removed (target v.0.9.0). Please use
+    :meth:`SerializableModelMixin.to_dill` and :meth:`SerializableModelMixin.from_dill` instead.