[gjs] release: Prepare for 1.51.91

[Philip Chimento <pchimento src gnome org>]

commit 542f9b7bb6e84e0a90b1f613ed22cf26f622efbe
Author: Philip Chimento <philip chimento gmail com>
Date:   Mon Feb 19 14:22:42 2018 -0800

    release: Prepare for 1.51.91

 NEWS | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/NEWS b/NEWS
index 193939e..a3ca744 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,17 @@
+Version 1.51.91
+---------------
+
+- Promises now resolve with a higher priority, so asynchronous code should be
+  faster. [Jason Hicks]
+
+- Closed bugs and merge requests:
+
+  * New build 'warnings' [#117, !62, !63, Claudio André, Philip Chimento]
+  * Various CI maintenance [!64, !65, !66, Claudio André, Philip Chimento]
+  * profiler: Don't include alloca.h when disabled [!69, Ting-Wei Lan]
+  * GNOME crash with fatal error "Finalizing proxy for an object that's
+    scheduled to be unrooted: Gio.Subprocess" in gjs [#26, !70, Philip Chimento]
+
 Version 1.51.90
 ---------------