Added gaps at the end of the storage of each contract.

contracts/utils/Address.sol

@@ -25,5 +25,4 @@ library Address {
     assembly { size := extcodesize(account) }
     return size > 0;
   }
-
 }

contracts/utils/ReentrancyGuard.sol

@@ -32,4 +32,5 @@ contract ReentrancyGuard is Initializable {
     require(localCounter == _guardCounter);
   }
 
+  uint256[50] private ______gap;
 }