Majority actualizado para solc 0.7

src/Majority/Majority.sol

 // Robert Martin-Legene <robert@nic.ar>
 // vim:syntax:filetype=javascript:ai:sm
 
-pragma solidity ^0.5;
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+// Copyright 2020 de la Direccion General de Sistemas Informaticos - Secretaria Legal y Tecnica - Nacion - Argentina.
+//
+// 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.
+//
+// You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/
+
+pragma solidity >0.7.0;
 
 // This contract is supposed to maintain a list of accounts authorized
 // to control members of "the club" using a majority (n/1+1). We call
@@ -27,7 +37,7 @@ contract Majority {
     event               voteCast( address voter, address victim, bool promotion );
     event               adminChange( address admin, bool promotion );
 
-    constructor( uint timeout ) public
+    constructor( uint timeout )
     {
         if ( timeout >= 3600 )
             votetimeout         =   timeout;
@@ -70,7 +80,7 @@ contract Majority {
         while ( ++idx < max )
             votes[idx-1] = votes[idx];
         // "pop" the end of the list, making the list shorter.
-        votes.length--;
+	votes.pop();
     }
 
     function    _remove_council_member( address exmember ) private
@@ -92,7 +102,7 @@ contract Majority {
                 while ( ++idx < max )
                     council[idx-1] = council[idx];
                 // "pop" the end of the list, making the list shorter.
-                council.length--;
+                council.pop();
                 return;
             }
         }