v1.4.0

Fixed

• Fix TypeError: Type is not JSON serializable: Timestamp when a figure contains datetime-like values such as a pandas Timestamp; these now serialize to ISO strings [#461], with thanks to @binggao1230 for the contribution!
• Fix orjson serialization of Decimal values [issue #453]

Changed

• Switch default MathJax version from v2 to v3 [#469]