[gjs] release: Prepare for 1.55.4

[Philip Chimento <pchimento src gnome org>]

commit 0e7cac9bc40702f9e4d6d22b7158efa5052e5195
Author: Philip Chimento <philip chimento gmail com>
Date:   Mon Jan 7 23:01:23 2019 -0800

    release: Prepare for 1.55.4

 NEWS | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/NEWS b/NEWS
index 5c80f3f6..6605ff6b 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+Version 1.55.4
+--------------
+
+- Closed bugs and merge requests:
+  * Various maintenance [!258, Philip Chimento]
+  * Boxed copy constructor should not be called, split Boxed into prototype and
+    instance structs [#215, !260, Philip Chimento]
+
 Version 1.55.3
 --------------