[gnome-builder] doc: suggest flathub for installation

[Christian Hergert <chergert src gnome org>]

commit fbe6df94ec797b3a040cae0ed165b63f7acbcd2a
Author: Christian Hergert <chergert redhat com>
Date:   Wed Oct 18 02:40:49 2017 -0700

    doc: suggest flathub for installation

 doc/installation.rst |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/doc/installation.rst b/doc/installation.rst
index d5f71c7..f230182 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -39,7 +39,7 @@ You can also use the command line to install Builder:
 
 .. code-block:: sh
 
-   $ flatpak install --user --from 
https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref?h=stable
+   $ flatpak install --from https://flathub.org/repo/appstream/org.gnome.Builder.flatpakref
    $ flatpak run org.gnome.Builder
 
 **Nightly**