[gjs] docs: Release notes about Promises

[Philip Chimento <pchimento src gnome org>]

commit 2b4e52fb1bfc43f396954be6ff3186fe5a347c0a
Author: Philip Chimento <philip endlessm com>
Date:   Tue Dec 13 11:33:58 2016 -0800

    docs: Release notes about Promises

 NEWS |   11 +++++++++++
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+NEXT
+----
+
+- New JavaScript feature: ES6 Promises. This release includes Lie [1], a small,
+  self-contained Promise implementation, which is imported automatically to
+  form the Promise global object [2]. In the future, Promises will be built into
+  the SpiderMonkey engine and Lie will be removed, but any code using Promises
+  will continue to work as before.
+  [1] https://github.com/calvinmetcalf/lie
+  [2] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
+
 Version 1.47.3
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