Update CHANGELOG

Author: mbostock

CHANGELOG.md

@@ -7,13 +7,13 @@
 The new *plot*.**scale**(*name*) method exposes scales used by a particular plot. This method on returned plots takes the *name* of a scale and returns an object containing scale options that fully describe the scale’s behavior. The returned object represents the actual options in-use, including *scale*.domain, *scale*.range, *scale*.interpolate, *etc.* The *scale*.label, if any, is also returned; however, note that other axis options are not. The scale object is undefined if the associated plot has no scale with the given *name*, and throws an error if the *name* is invalid (*i.e.*, not one of the known scale names: *x*, *y*, *fx*, *fy*, *r*, *color*, or *opacity*). For example, given a plot:
 
 ```js
-plot = Plot.dot(gistemp, {x: "Date", y: "Anomaly", stroke: "Anomaly"}).plot()
+myplot = Plot.dot(gistemp, {x: "Date", y: "Anomaly", stroke: "Anomaly"}).plot()
 ```
 
 You can retrieve the color scale like so:
 
 ```js
-color = plot.scale("color")
+mycolor = myplot.scale("color")
 ```
 
 The resulting object is:
@@ -31,7 +31,7 @@ The resulting object is:
 Inspecting materialized scales is useful for debugging and for generating color legends. (For now, we recommend using the [D3 color legend](https://observablehq.com/@d3/color-legend); in the near future Plot will have built-in support for color legends.) Scales can also now be shared between plots, ensuring consistent encoding. To reuse a scale, pass the scale from one plot into the specification for another:
 
 ```js
-Plot.plot({…, color: plot.scale("color")})
+Plot.plot({…, color: myplot.scale("color")})
 ```
 
 Plot now supports for piecewise (a.k.a. “polylinear”) scales. If a single-argument *interpolate* function is specified (such as d3.interpolateWarm, or equivalently if you specify a color *scheme* such as *warm*), and the *range* is undefined, and the *domain* has more than two elements, the range [0, 1] will be partitioned into *domain*.length - 1 same-sized segments. The default scale range for *x* and *y* now supports piecewise scales, as does the default axis tick count.