[tepl] NEWS file: start to write news for 5.99.1

[Sébastien Wilmet <swilmet src gnome org>]

commit 6efb85e0c129f4924fc427e47eaecdb9877613ea
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Nov 20 19:19:49 2020 +0100

    NEWS file: start to write news for 5.99.1

 NEWS | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
---
diff --git a/NEWS b/NEWS
index 1d933f0..2348e91 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,19 @@
+News in 5.99.1, xxxx-yy-zz (not yet released)
+--------------------------
+* API changes:
+ - The TeplInfoBar class has been reworked.
+
+* New API:
+ - tepl_pango_font_description_to_css()
+ - TeplLanguageChooser
+ - TeplLanguageChooserWidget
+ - TeplLanguageChooserDialog
+ - TeplProgressInfoBar
+ - Utility functions: add a few functions.
+
+* Misc:
+ - Translation updates.
+
 News in 5.1.1, 2020-10-11
 -------------------------
 * Add TeplSpaceDrawerPrefs, a preferences widget for GtkSourceSpaceDrawer.