[gnome-builder] doc: update copyright

[Christian Hergert <chergert src gnome org>]

commit 0bec68a0cf47871e6dc570e52c7cc95d3e481f68
Author: Christian Hergert <chergert redhat com>
Date:   Sun May 5 22:12:57 2019 -0700

    doc: update copyright

 doc/help/conf.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/doc/help/conf.py b/doc/help/conf.py
index aa82560f2..7ebd0c492 100644
--- a/doc/help/conf.py
+++ b/doc/help/conf.py
@@ -50,7 +50,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = 'Builder'
-copyright = '2018, Christian Hergert, et al.'
+copyright = '2017-2019, Christian Hergert, et al.'
 author = 'Christian Hergert, et al.'
 
 # The version info for the project you're documenting, acts as replacement for