Update CHANGELOG

Author: mbostock

CHANGELOG.md

@@ -60,7 +60,7 @@ All marks now support the new standard *href* channel and *target* option, turni
 Plot.barY(alphabet, {x: "letter", y: "frequency", href: d => `https://en.wikipedia.org/wiki/${d.letter}`})
 ```
 
-The bin and group transforms now propagate the *title* and *href* channels, if present, by default. The default reducer for the *title* channel automatically selects the top five distinct title values per bin by count.
+The bin and group transforms now propagate the *title* and *href* channels, if present, by default. The default reducer for the *title* channel automatically selects the top five distinct title values by count.
 
 [<img src="./img/bin-title.png" width="656" alt="a histogram of penguins by species">](https://observablehq.com/@observablehq/plot-bin)