Docs: Update readme

org-ql.info

@@ -859,7 +859,10 @@ File: README.info,  Node: 06-pre,  Next: 05,  Up: Changelog
 5.1 0.6-pre
 ===========
 
-Nothing new yet.
+*Internal*
+   • Predicates are now defined more cleanly with a macro that
+     consolidates functionality related to each predicate.  This will
+     also allow users to more easily define custom predicates.
 
 
 File: README.info,  Node: 05,  Next: 049,  Prev: 06-pre,  Up: Changelog
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