[gegl] NEWS: mention pdf-load

[Øyvind "pippin" Kolås <ok src gnome org>]

commit e6e673408cea212b6bef3f5ad2fbd2b017eae4eb
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Feb 27 18:24:44 2019 +0100

    NEWS: mention pdf-load

 docs/NEWS.txt | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/docs/NEWS.txt b/docs/NEWS.txt
index 55fa67aba..e4929c833 100644
--- a/docs/NEWS.txt
+++ b/docs/NEWS.txt
@@ -57,6 +57,8 @@ value-propagate.
 gaussian-blur: fix mistake in implementation of IIR Young blur 1d, which caused
 non circular halos.
 
+New operation: pdf-load with build dependency on poppler-glib
+
 Added offset properties to pixelize filter.
 
 new ops in workshop: voroni diagram, Grey Color Removal, spyrograph.