[release-notes] More developer features: gjs

[Matthias Clasen <matthiasc src gnome org>]

commit 1f9166b7dcca941933d14411c21413e3c5730593
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Sep 2 17:40:54 2020 -0400

    More developer features: gjs

 help/C/developers.page | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/help/C/developers.page b/help/C/developers.page
index 71cfc688..0f0e1a9d 100644
--- a/help/C/developers.page
+++ b/help/C/developers.page
@@ -55,6 +55,17 @@
     <p>The tracker3 commandline tool has also seen many improvements.</p>
   </section>
 
+  <section>
+    <title>gjs</title>
+    <p>GJS has been updated to use Spidermonkey version 78. This brings
+    a number of new language features, such as the ?? operator ("nullish
+    coalescing operator") and the ?. operator ("optional chaining operator"),
+    public static class fields, support for separators in numeric literals
+    (like 1_000_000), a more powerful regular expression engine with
+    lookbehind and named capture groups, and useful methods such as
+    String.replaceAll() and Intl.RelativeTimeFormat.formatToParts().</p>
+  </section>
+
   <section id="more">
     <title>Other Improvements</title>
     <p>Other improvements in GNOME &gnomeversion; include:</p>