Update docs

Author: jeffgbutler

CHANGELOG.md

@@ -103,7 +103,8 @@ Runtime behavior changes:
 - Rendering for all the conditions (isEqualTo, etc.) has changed. This should be transparent to most users unless you
   have coded a direct implementation of `VisitableCondition`. The change makes it easier to code custom conditions that
   are not supported by the library out of the box. The statement renderers now call methods `renderCondition` and
-  `renderLeftColumn` that you can override to implement any rendering you need.  
+  `renderLeftColumn` that you can override to implement any rendering you need. In addition, we've made `filter` and
+  `map` support optional if you implement custom conditions
 
 ## Release 1.5.2 - June 3, 2024