[geocode-glib/bilelmoussaoui/gi-docgen: 7/9] README: mention the nightly docs

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 91695a54da6558b1fe3b20fbcbffa6a4775fc8b2
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Fri Jan 14 13:30:14 2022 +0100

    README: mention the nightly docs

 README | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/README b/README
index 5e4249d..2992aa7 100644
--- a/README
+++ b/README
@@ -18,6 +18,9 @@ Applications using geocode-glib
 Links
 -----
 
+Nightly documentations:
+https://gnome.pages.gitlab.gnome.org/geocode-glib/
+
 Nominatim API:
 http://wiki.openstreetmap.org/wiki/Nominatim