release 0.9.76 testing: GPLv3 copyright

Author: netblue30

platform/debian/copyright

@@ -18,9 +18,8 @@ This is the Debian/Ubuntu prepackaged version of fdns.
     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, write to the Free Software Foundation, Inc., 51
-    Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 The complete text of the GNU General Public License can be found
 in /usr/share/common-licenses/GPL-3.