[gxml] NEWS: Updated for API changes

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 2be8ccdce49d3ca91df161b6cf35008af6972655
Author: Daniel Espinosa <esodan gmail com>
Date:   Mon Jul 8 09:53:31 2019 -0500

    NEWS: Updated for API changes

 NEWS | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
---
diff --git a/NEWS b/NEWS
index e1eb573..ebe86c6 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,26 @@
+===============
+Version 0.20.0
+===============
+* Transsition from pre 0.20 API, can be found at Wiki https://gitlab.gnome.org/GNOME/gxml/wikis/home
+* API simplification (breaks)
+* Revome of obsolete and deprecated API
+* Meson: options renaming
+* Gom* classes renamed by removing the Gom prefix (API simplification)
+  this means, for example: GomDocument to Document and GomElement to Element.
+* No DOM4 API changes made
+* General interfaces removed
+* TNode derived classes removed
+* GNode derived classes (libxml2) renamed to XNode derived ones (GDocument to XDocument)
+* Documentation updates
+
+===============
+Version 0.18.1
+===============
+* GParser: fix create_stream() using string.data
+* build: add support for darwin_versions thanks to Tom Schoonjans <Tom Schoonjans diamond ac uk>
+* Add missing meson files in tarball created with autotools
+* Meson: renamed options removing enable and disable prefix
+
 ===============
 Version 0.18.0
 ===============