Update release-next for the 1.4 release.

release-next.md

@@ -2,11 +2,26 @@
 
 ## **New Features**
 
-None.
+- **Add initial implementation of DatasetTransformer.**
+
+    [PR#240](https://github.com/microsoft/NimbusML/pull/240)
+    This transform allows a fitted transformer based model to be inserted
+    in to another `Pipeline`.
+
+    ```python
+    Pipeline([
+        DatasetTransformer(transform_model=transform_pipeline.model),
+        OnlineGradientDescentRegressor(label='c2', feature=['c1'])
+    ])
+    ```
 
 ## **Bug Fixes**
 
-None.
+- **Fixed `classes_` attribute when no `y` input specified **
+
+    [PR#218](https://github.com/microsoft/NimbusML/pull/218)
+    Fix a bug with the classes_ attribute when no y input is specified during fitting.
+    This addresses [issue 216](https://github.com/microsoft/NimbusML/issues/216)
 
 ## **Breaking Changes**