Add schemeObservable10

ref. observablehq/plot#1895

src/categorical/observable10.js

@@ -0,0 +1,3 @@
+import colors from "../colors.js";
+
+export default colors("4269d0efb118ff725c6cc5b03ca951ff8ab7a463f297bbf59c6b4e9498a0");

src/index.js

@@ -1,6 +1,7 @@
 export {default as schemeCategory10} from "./categorical/category10.js";
 export {default as schemeAccent} from "./categorical/Accent.js";
 export {default as schemeDark2} from "./categorical/Dark2.js";
+export {default as schemeObservable10} from "./categorical/observable10.js";
 export {default as schemePaired} from "./categorical/Paired.js";
 export {default as schemePastel1} from "./categorical/Pastel1.js";
 export {default as schemePastel2} from "./categorical/Pastel2.js";

test/index-test.js

@@ -51,6 +51,7 @@ it("exports the expected schemes", () => {
     "schemeGnBu",
     "schemeGreens",
     "schemeGreys",
+    "schemeObservable10",
     "schemeOrRd",
     "schemeOranges",
     "schemePRGn",