Remove unnecessary shebangs

How this isn't a Ricky Martin song, we'll never know

lector/settings.py

@@ -1,4 +1,19 @@
-#!/usr/bin/env python3
+# This file is a part of Lector, a Qt based ebook reader
+# Copyright (C) 2017-2018 BasioMeusPuga
+
+# 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/>.
+
 # Keep in mind that all integer / boolean settings are returned as strings
 
 import os