[gvfs] Update NEWS for 1.39.90 release

[Ondrej Holy <oholy src gnome org>]

commit 38fdff90ee433892480a390cb4c82f7d8331f88e
Author: Ondrej Holy <oholy redhat com>
Date:   Mon Feb 4 12:22:07 2019 +0100

    Update NEWS for 1.39.90 release

 NEWS | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/NEWS b/NEWS
index 2dc237e2..084331b3 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,12 @@
+Major changes in 1.39.90
+========================
+* sftp: Always use port 22 if not specified
+* mtp: Don't retry reading an event after failure
+* admin: Prevent access if any authentication agent isn't available
+* build: Several meson improvements
+* Several smaller bugfixes
+* Translation updates
+
 Major changes in 1.39.4
 =======================
 * keyring: Prefer the most recent item