Update COPYING to reflect man page and project page.

COPYING

 Password Store is Copyright (C) 2012 Jason A. Donenfeld <Jason@zx2c4.com>.
 
 
-    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 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 2 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.
+This program is distributed in the hope that it  will  be  useful,  but
+WITHOUT  ANY  WARRANTY;  without  even  the  implied  warranty  of MER‐
+CHANTABILITY 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/>.
+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.,
+675 Mass Ave, Cambridge, MA 02139, USA.