[gegl] Fix typo in copyright - gegl-visitor.h

[Øyvind "pippin" Kolås <ok src gnome org>]

commit e7f07966046d1c93486e5ddee9a6480b81578afa
Author: Schwan Carl <schwancarl protonmail com>
Date:   Mon Jul 22 21:24:37 2019 +0000

    Fix typo in copyright - gegl-visitor.h

 gegl/graph/gegl-visitor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gegl/graph/gegl-visitor.h b/gegl/graph/gegl-visitor.h
index 9098f65b1..69f85b69c 100644
--- a/gegl/graph/gegl-visitor.h
+++ b/gegl/graph/gegl-visitor.h
@@ -14,7 +14,7 @@
  * License along with GEGL; if not, see <https://www.gnu.org/licenses/>.
  *
  * Copyright 2003 Calvin Williamson
- *           2917 Ell
+ *           2017 Ell
  */
 
 #ifndef __GEGL_VISITOR_H__