Fix the formatting in a copyright statement.

diff --git a/source/grid/cell_id.cc b/source/grid/cell_id.cc
index 282276104b6304979251026752d1f02ecaaa66c1..33736bd4a3615aa92b347ae3939e93345e6eed9a 100644 (file)
--- a/source/grid/cell_id.cc
+++ b/source/grid/cell_id.cc
@@ -1,6 +1,6 @@
 // ---------------------------------------------------------------------
 //
-// Copyright (C) 2015 - 2016,2016 by the deal.II authors
+// Copyright (C) 2015 - 2017 by the deal.II authors
 //
 // This file is part of the deal.II library.
 //