[gegl] NEWS: add release dates the latest releases

[Øyvind Kolås <ok src gnome org>]

commit c8f75da0d1c681dceec54ebf2a90f439e220c574
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Aug 16 12:59:00 2017 +0200

    NEWS: add release dates the latest releases

 docs/NEWS.txt |   11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/docs/NEWS.txt b/docs/NEWS.txt
index 365f261..396eae5 100644
--- a/docs/NEWS.txt
+++ b/docs/NEWS.txt
@@ -1,4 +1,5 @@
-GEGL-0.3.20
+GEGL-0.3.20 2017-08-15
+----------------------
 
 Core
 ~~~~
@@ -35,8 +36,8 @@ Contributors
 Prokoudine, Eugene Hopkinson, Ell, Thomas Manni, Jordi Mas, Edward E, Jan
 Vesely, Arfrever Frehtes Taifersar Arahesis.
 
-GEGL-0.3.18
------------
+GEGL-0.3.18 2017-05-31
+----------------------
 
 Operations
 ~~~~~~~~~~
@@ -60,8 +61,8 @@ Contributors
 
 Ell, Anton Gorenko, Øyvind Kolås, Piotr Drąg, Mario Blättermann 
 
-GEGL-0.3.16
------------
+GEGL-0.3.16 2017-05-15
+----------------------
 
 Core
 ~~~~