[canvaskit] Roll to 0.20.0

Change-Id: I5025a5ca8deca45dfe3e222e3bf4b6f047416eb4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/334419
Reviewed-by: Kevin Lubick <kjlubick@google.com>

modules/canvaskit/CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.0] - 2020-11-12
+
 ## Added
  - `MakeFractalNoise`, `MakeImprovedNoise`, and `MakeTurbulence` have been added to
    `CanvasKit.Shader`.

modules/canvaskit/canvaskit/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "canvaskit-wasm",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

modules/canvaskit/canvaskit/package.json

@@ -1,6 +1,6 @@
 {
   "name": "canvaskit-wasm",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "description": "A WASM version of Skia's Canvas API",
   "main": "bin/canvaskit.js",
   "homepage": "https://github.com/google/skia/tree/master/modules/canvaskit",