Added copyright comment.

Makefile

+# Copyright (C) 2020 David Byers
+#
+# Author: David Byers <david.byers@liu.se>
+# Version: 1.0
+# Package-Requires: ((emacs "25.1"))
+# Keywords: extensions, lisp
+# URL: https://gitlab.liu.se/davby02/olc
+#
+# This program is free software: you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation, either version 3 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see
+# <https://www.gnu.org/licenses/>.
+
 all: olc.elc olc.info
 
 olc.elc: olc.el