[gxml] Updated NEWS for current master

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 47a327dd932a815e68660be2a181e826aed0966f
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Mar 21 13:12:48 2019 -0600

    Updated NEWS for current master

 NEWS | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/NEWS b/NEWS
index 03a907d..cc7e2f6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,9 @@
 ===============
 Version 0.18.0
 ===============
+* GomDocument now can detect default root property, instantiate it
+  on reading
+* New API in DomDocument and DomElement for read/write operations
 * New serialization methods for DomElement and DomDocument interfaces
 * Now all GomElement attributes are available from 'attributes' property,
   this include basic and Object's implementing GomProperty
@@ -11,6 +14,8 @@ Version 0.18.0
 * Deprecated Node and derived classes
 * Deprecated Serializable and derived classes
 * Fixes on Unit Tests
+* Added benchmark tests
+* Documentation updates
 * Updated translations:
     Hungarian  by                Balázs Úr <balazs urbalazs hu>
     Indonesian by                Kukuh Syafaat <kukuhsyafaat gnome org>