First draft of the Asciidoctor.js 1.5.0 release announcement

I'm not really satisfied, maybe we can write more about what's in the release ?
I think I'm too specific on how to use Asciidoctor.js but it's hard to write less. You can't really explain how to use Asciidoctor.js, if you don't explain a little bit of Opal... but do we want to explain how to use Asciidoctor.js in the release announcement ?

I really like the Asciidoctor 1.5.0 release announcement, maybe we can stick with this format ?

 * Highlights
  * Asciidoctor.js is Asciidoctor
  * Node package
  * Bower package


What do you think? 

Let's add an acknowledgement section. We especially want to call out the Opal team for creating Opal and being responsive to the challenges we've faced. We shouldn't take for granted that a project like Opal would take the time to help projects that build on it...because I can think of lots of examples when that's not the case.