[gtksourceview] README: update nightly documentation link

[Christian Hergert <chergert src gnome org>]

commit e8277ee628a8387a1bd0581f96661e9eeb51aaab
Author: Christian Hergert <chergert redhat com>
Date:   Wed Dec 1 16:14:09 2021 -0800

    README: update nightly documentation link

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 209c6599..62306925 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ The official web site is https://wiki.gnome.org/Projects/GtkSourceView.
 Documentation
 -------------
 
-Nightly documentation can be [found 
here](https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview-5.0/).
+Nightly documentation can be [found 
here](https://gnome.pages.gitlab.gnome.org/gtksourceview/gtksourceview5/).
 
 Dependencies
 ------------