[pygobject] Update openSUSE instructions More packages are required to be able to run the example on the getting

[Christoph Reiter <creiter src gnome org>]

commit d2594956086e01e257f0583274cf22ee90feb110
Author: Wouter <wwijsman live nl>
Date:   Sat Dec 28 19:23:33 2019 +0000

    Update openSUSE instructions
    More packages are required to be able to run the example on the getting started page on openSUSE

 docs/getting_started.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/getting_started.rst b/docs/getting_started.rst
index c171b788..a2f53dd3 100644
--- a/docs/getting_started.rst
+++ b/docs/getting_started.rst
@@ -127,7 +127,7 @@ Installing from PyPI with pip:
 
 Installing the system provided PyGObject:
   #) Open a terminal
-  #) Execute ``sudo zypper install python3-gobject gtk3``
+  #) Execute ``sudo zypper install python3-gobject python3-gobject-Gdk typelib-1_0-Gtk-3_0 libgtk-3-0``
   #) Change the directory to where your ``hello.py`` script can be found
   #) Run ``python3 hello.py``