queryman.py: restore license text

Author: flashcode

python/queryman.py

@@ -4,6 +4,19 @@
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 #
+# 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 <http://www.gnu.org/licenses/>.
+#
 # Save and restore query buffers after /quit.
 #
 # Idea by lasers@freenode.#weechat