[tracker-miners] Update NEWS with 2.3.0-alpha1 features

[Sam Thursfield <sthursfield src gnome org>]

commit 54897caf850bc5e665663dde2f45bb112b1576f0
Author: Sam Thursfield <sam afuera me uk>
Date:   Mon Aug 5 17:52:58 2019 +0200

    Update NEWS with 2.3.0-alpha1 features

 NEWS | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/NEWS b/NEWS
index 0fb16ac71..6ec18fcfc 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,14 @@
+NEW in 2.2.3-alpha1 - unreleased
+=========================
+
+  * Support for reading Musicbrainz metadata from audio files.
+  * Tracker Writeback now uses GStreamer to write metadata to audio files,
+    instead of depending on taglib directly.
+  * Directories will now be ignored if they contain a file named `.nomedia`.
+    A file named `.trackerignore` has the same effect, but the `.nomedia` file
+    brings us in line with Android.
+  * Removed obsolete 'max-media-art-width' setting.
+
 NEW in 2.2.2 - 2019-05-02
 =========================