Update to a hopefully more future proof FSF address

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/feature_to_c.sh b/feature_to_c.sh
index bce77b6..53975eb 100644
--- a/feature_to_c.sh
+++ b/feature_to_c.sh
@@ -17,9 +17,7 @@
 # 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 Street, Fifth Floor,
-# Boston, MA 02110-1301, USA.
+# along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 output=$1
 shift