Call out nautilus 3.26 as optional

As requested on !5.

Call out nautilus 3.26 as optional
As requested on !5.
ba79a26a · Simon McVittie · 92d0e7f7 · ba79a26a
Commit ba79a26a authored Mar 07, 2018 by Simon McVittie
--- a/README.md
+++ b/README.md
@@ -28,10 +28,10 @@ RUNTIME DEPENDENCIES
  - gsettings-desktop-schemas (>= 3.27.90)
  - gnome-shell (>= 3.24)
  - mutter
-  - nautilus

 * Optional:
   - gnome-software (for links from GNOME Shell Extensions page)
+   - nautilus 3.26 or older (for icons on the desktop)

 RUNNING
 -------