DOC: update release notes

RELEASE_NOTES.rst

@@ -4,6 +4,21 @@ Release Notes
 *fluxus* 1.0
 ------------
 
+*fluxus* 1.0.3
+~~~~~~~~~~~~~~
+
+- API: Rename methods ``iter_concurrent_conduits`` to ``iter_concurrent_producers``,
+  and ``aiter_concurrent_conduits`` to ``aiter_concurrent_producers``
+- API: Return iterators not lists from :meth:`.SerialTransformer.process` and
+  :meth:`.SerialTransformer.aprocess` for greater flexibility in processing the results
+- API: Removed functions ``iter()`` and ``aiter()`` from class
+  :class:`.SerialTransformer`, to further streamline the API and given they can be
+  easily replaced by repeated calls to :meth:`.SerialTransformer.process` and
+  :meth:`.SerialTransformer.aprocess`
+- FIX: Updated logic for iterating over concurrent producers and transformers to ensure
+  shared conduits never run more than once
+
+
 *fluxus* 1.0.2
 ~~~~~~~~~~~~~~