[balsa] COPYING: Update FSF contact info

[Peter Bloomfield <peterb src gnome org>]

commit 6fa9adc08e8882ce15461cb3eaf67d085edb3611
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sun Feb 16 20:33:01 2020 -0500

    COPYING: Update FSF contact info

 COPYING | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/COPYING b/COPYING
index 60549be51..89a8e9efa 100644
--- a/COPYING
+++ b/COPYING
@@ -1,8 +1,7 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 2, June 1991
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
-                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.  <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
@@ -304,8 +303,7 @@ the "copyright" line and a pointer to where the full notice is found.
     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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 
 Also add information on how to contact you by electronic and paper mail.