Make sure to note how people can update depends.
Make sure to note how people can update depends.

Prior to this change it wasn't known by most people that you can in-fact use our image to update your dependencies if you needed to, and we do recommend you do.  This commit changes that so that people know they can do that.
jekyll/docker,TheSpyder/jekyll-docker,jekyll/docker,TheSpyder/jekyll-docker