[gtk-web] Fix typo in the Python code snippet

[Emmanuele Bassi <ebassi src gnome org>]

commit 2dee849f2f223822aab0eda1235744c8647cfdac
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Feb 21 16:17:08 2020 +0000

    Fix typo in the Python code snippet

 _data/sample_codes.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/_data/sample_codes.yml b/_data/sample_codes.yml
index 32defc2..5e000af 100644
--- a/_data/sample_codes.yml
+++ b/_data/sample_codes.yml
@@ -30,7 +30,7 @@ codes:
       ```python
       # Load Gtk
       import gi
-      gi.require_version('Gtk', '3,0')
+      gi.require_version('Gtk', '3.0')
       from gi.repository import Gtk
 
       # When the application is launched…