0.5.3 -> 0.5.5 in erc1155 contracts

contracts/erc1155/contracts/src/ERC1155.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "@0x/contracts-utils/contracts/src/SafeMath.sol";
 import "@0x/contracts-utils/contracts/src/Address.sol";

contracts/erc1155/contracts/src/ERC1155Mintable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "@0x/contracts-utils/contracts/src/SafeMath.sol";
 import "./ERC1155.sol";

contracts/erc1155/contracts/src/MixinNonFungibleToken.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "./mixins/MNonFungibleToken.sol";
 

contracts/erc1155/contracts/src/interfaces/IERC1155.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 /// @title ERC-1155 Multi Token Standard

contracts/erc1155/contracts/src/interfaces/IERC1155Mintable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "./IERC1155.sol";
 

contracts/erc1155/contracts/src/interfaces/IERC1155Receiver.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 interface IERC1155Receiver {

contracts/erc1155/contracts/src/mixins/MNonFungibleToken.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 contract MNonFungibleToken {

contracts/erc1155/contracts/test/DummyERC1155Receiver.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 import "../src/interfaces/IERC1155Receiver.sol";
 

contracts/utils/contracts/src/Address.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.5.3;
+pragma solidity ^0.5.5;
 
 
 /**