Updated changelog.

Author: hcpchris

CHANGES.rst

@@ -1,3 +1,29 @@
+
+Release 1.4.0
+=========================================
+
+* **MAJOR** performance gains in the ``.to_js_literal()`` method. Implementation seems to
+  improve performance by 50 - 90%.
+* *SIGNIFICANT* performance gains in the ``.to_json()`` method. Implementation seems to 
+  improve performance by 30 - 90%.
+* **ENHANCEMENT:** Significantly simplified use of the ``.from_pandas()`` method to support:
+
+  * creation of multiple series from one DataFrame in one method call
+  * creation of series without needing to specify a full property map
+  * support for creating series by DataFrame row, rather than just by DataFrame column
+
+* **ENHANCEMENT:** Added the ``.from_pandas_in_rows()`` method to support creation of
+  charts and series from simple two-dimensional DataFrames laid out in rows.
+* **ENHANCEMENT:** Added one-shot chart creation and rendering from Series objects.
+* **ENHANCEMENT:** Added one-shot chart creation using ``series`` and ``data``/``series_type`` keywords.
+* **ENHANCEMENT:** Added ``.convert_to()`` convenience method to Series objects.
+* **ENHANCEMENT:** Added ``CallbackFunction.from_python()`` method which converts a Python function
+  to its JavaScript equivalent using generative AI, with support for both OpenAI and Anthropic.
+* **BUGFIX:** Fixed instability issues in Jupyter Notebooks, both when operating as a Notebook (outside of 
+  Jupyter Lab) and when saved to a static HTML file.
+
+---------------------
+
 Release 1.3.0
 =========================================