Include steps for publishing to AWS/CDN (#1002)

* Include steps for publishing to AWS/CDN

* Update CDN publishing docs

Co-authored-by: Arindam Bose <arindam.bose@mapbox.com>

Author: Asheem Mamoowala

README.md

@@ -56,7 +56,7 @@ var map = new mapboxgl.Map({
 var Draw = new MapboxDraw();
 
 // Map#addControl takes an optional second argument to set the position of the control.
-// If no position is specified the control defaults to `top-right`. See the docs 
+// If no position is specified the control defaults to `top-right`. See the docs
 // for more details: https://docs.mapbox.com/mapbox-gl-js/api/#map#addcontrol
 
 map.addControl(Draw, 'top-left');
@@ -103,6 +103,16 @@ git push
 npm publish
 ```
 
+To CDN
+
+```
+# make sure you are authenticated for AWS
+git checkout v{x.y.z}
+yarn install
+yarn run prepublish
+aws s3 cp --recursive --acl public-read dist s3://mapbox-gl-js/plugins/mapbox-gl-draw/v{x.y.z}
+```
+
 Update the version number in [the GL JS example](https://github.com/mapbox/mapbox-gl-js/blob/publisher-production/docs/pages/example/mapbox-gl-draw.html).
 
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