Update CHANGELOG

Author: mbostock

CHANGELOG.md

@@ -54,29 +54,23 @@ Plot.plot({
 
 [breaking] Color scales with diverging color schemes now default to the *diverging* scale type instead of the *linear* scale type. This includes the *brbg*, *prgn*, *piyg*, *puor*, *rdbu*, *rdgy*, *rdylbu*, *rdylgn*, *spectral*, *burd*, and *buylrd* schemes. If you want to use a diverging color scheme with a linear color scale, set the scale **type** to *linear*. Color scales will also default to diverging if the scale **pivot** option is set. (For diverging scales, the **pivot** option defaults to zero.)
 
-The **sort** transform option now supports sorting on an existing channel, avoiding the need to duplicate the channel definition. For example, to sort dots by ascending radius:
+The [sort transform](./README.md#plotsortorder-options) now supports sorting on an existing channel, avoiding the need to duplicate the channel definition. For example, to sort dots by ascending radius:
 
 ~~~js
 Plot.dot(earthquakes, {x: "longitude", y: "latitude", r: "intensity", sort: {channel: "r"}})
 ~~~
 
-The dot mark now sorts by descending radius by default to reduce occlusion.
-
-The [dot mark](./README.md#dot) now supports the *hexagon* symbol type for pointy-topped hexagons. The new [circle](./README.md#plotcircledata-options) and [hexagon](./README.md#plothexagondata-options) marks are convenience shorthand for dot marks with the *circle* and *hexagon* symbol, respectively. The dotX, dotY, textX, and textY marks now support the **interval** option.
-
-The new [hexgrid decoration mark](./README.md#hexgrid) draws a hexagonal grid. It is intended to be used with the hexbin transform as an alternative to the default horizontal and vertical axis grid.
+The [dot mark](./README.md#dot) now sorts by descending radius by default to reduce occlusion. The dot mark now supports the *hexagon* symbol type for pointy-topped hexagons. The new [circle](./README.md#plotcircledata-options) and [hexagon](./README.md#plothexagondata-options) marks are convenience shorthand for dot marks with the *circle* and *hexagon* symbol, respectively. The dotX, dotY, textX, and textY marks now support the **interval** option. The rule mark now correctly respects the **dx** and **dy** options. The new [hexgrid decoration mark](./README.md#hexgrid) draws a hexagonal grid. It is intended to be used with the hexbin transform as an alternative to the default horizontal and vertical axis grid.
 
 The **zero** scale option (like the **nice** and **clamp** options) may now be specified as a top-level option, applying to all quantitative scales.
 
-The rule mark now correctly respects the **dx** and **dy** options.
-
 Fix a crash when using area mark shorthand.
 
 Marks can now define a channel hint to set the default range of the *r* scale. This is used by the hexbin transform when producing an *r* output channel.
 
 Improve the performance of internal array operations, including type coercion. Thanks, @yurivish!
 
-[breaking] *mark*.initialize return signature.
+[breaking] The return signature of the internal *mark*.initialize method has changed. It now returns a {data, facets, channels} object instead of {index, channels}, and *channels* is now represented as an object with named properties representing channels rather than an iterable of [*name*, *channel*].
 
 ## 0.4.3