add firefox implementation in progress bugzilla link

Author: caridy

README.md

@@ -42,8 +42,9 @@ to start a watcher on `index.bs` that will update `index.html` as you edit.
 
 It is to early to know about the Loader, first we need ES2015 modules implemented by the various engines. Current status:
 
- * IE: [Under Consideration](https://status.modern.ie/moduleses6?term=modules)
- * V8: [In progress](https://code.google.com/p/v8/issues/detail?id=1569)
+ * IE/Edge: [Under Consideration](https://status.modern.ie/moduleses6?term=modules)
+ * Firefox: [In progress](https://bugzilla.mozilla.org/show_bug.cgi?id=568953)
+ * Chrome: [In progress](https://code.google.com/p/v8/issues/detail?id=1569)
  * Webkit: [Meta Bug](https://bugs.webkit.org/show_bug.cgi?id=147340)
 
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