- Fix license due to problems with OpenSSL

COPYING

@@ -1,3 +1,15 @@
+qBittorrent is licensed under the GNU General Public License version 2 with the
+addition of the following special exception:
+
+In addition, as a special exception, the copyright holders give permission to
+link this program with the OpenSSL project's "OpenSSL" library (or with
+modified versions of it that use the same license as the "OpenSSL" library),
+and distribute the linked executables. You must obey the GNU General Public
+License in all respects for all of the code used other than "OpenSSL".  If you
+modify file(s), you may extend this exception to your version of the file(s),
+but you are not obligated to do so. If you do not wish to do so, delete this
+exception statement from your version.
+
 		    GNU GENERAL PUBLIC LICENSE
 		       Version 2, June 1991