Merge pull request #247 from MoMannn/solidity-0.8.x

Update solidity to 0.8.0.

Author: xpepermint

.solhint.json

@@ -1,9 +1,6 @@
 {
   "extends": "solhint:default",
   "rules": {
-    "indent": ["error", 2],
-    "bracket-align": "off",
-    "two-lines-top-level-separator": "off",
-    "max-line-length": 100
+    "max-line-length": ["warn", 100]
   }
 }

CONTRIBUTING.md

@@ -18,9 +18,8 @@ The full style guide is available [here](https://github.com/0xcert/solidity-styl
 
 The release manager is responsible to follow this process for each release of this project.
 
-1. Confirm that the [version we reference](https://github.com/0xcert/ethereum-erc721/blob/master/src/contracts/math/safe-math.sol) for SafeMath is the [latest released version](https://github.com/0xcert/framework/tree/master/packages/0xcert-ethereum-utils-contracts/src/contracts/math).
-2. Summarize the changes and create a release using [GitHub releases](https://github.com/0xcert/solidity-style-guide/releases).
-3. Create a branch/pull request against https://github.com/0xcert/framework/tree/master/packages/0xcert-ethereum-erc721-contracts for any relevant changes since the last release here
+1. Summarize the changes and create a release using [GitHub releases](https://github.com/0xcert/solidity-style-guide/releases).
+2. Create a branch/pull request against https://github.com/0xcert/framework/tree/master/packages/0xcert-ethereum-erc721-contracts for any relevant changes since the last release here
 
 ```
 $ npm i

README.md

@@ -77,7 +77,7 @@ You have created and have possession of unique glass-blown artwork (each having
 To do this, simply paste the code below into Remix and deploy the smart contract. You will "mint" a token for each new piece of artwork you want to see. Then you will "burn" that token when you surrender physical possession of the piece.
 
 ```solidity
-pragma solidity 0.6.2;
+pragma solidity 0.8.0;
 
 import "https://github.com/0xcert/ethereum-erc721/src/contracts/tokens/nf-token-metadata.sol";
 import "https://github.com/0xcert/ethereum-erc721/src/contracts/ownership/ownable.sol";

package-lock.json

@@ -68,14 +68,14 @@
     "standard"
   ],
   "devDependencies": {
-    "@specron/cli": "0.15.1",
-    "@specron/flattener": "0.15.1",
-    "@specron/spec": "0.15.1",
-    "@types/node": "13.7.0",
-    "solc": "0.6.2",
-    "solhint": "2.3.0",
-    "ts-node": "8.6.2",
-    "typescript": "3.7.5",
-    "web3": "1.2.5-rc.0"
+    "@specron/cli": "0.17.1",
+    "@specron/flattener": "0.17.1",
+    "@specron/spec": "0.17.1",
+    "@types/node": "14.14.20",
+    "solc": "0.8.0",
+    "solhint": "3.3.2",
+    "ts-node": "9.1.1",
+    "typescript": "4.1.3",
+    "web3": "1.3.1"
   }
 }

package.json

@@ -1,4 +1,5 @@
-pragma solidity 0.6.2;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.0;
 
 import "../../contracts/tokens/nf-token-enumerable.sol";
 import "../ownership/ownable.sol";

src/contracts/math/safe-math.sol

@@ -1,4 +1,5 @@
-pragma solidity 0.6.2;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.0;
 
 import "../tokens/nf-token-metadata.sol";
 import "../tokens/nf-token-enumerable.sol";
@@ -23,7 +24,6 @@ contract NFTokenMetadataEnumerableMock is
     string memory _name,
     string memory _symbol
   )
-    public
   {
     nftName = _name;
     nftSymbol = _symbol;

src/contracts/mocks/nf-token-enumerable-mock.sol

@@ -1,4 +1,5 @@
-pragma solidity 0.6.2;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.0;
 
 import "../tokens/nf-token-metadata.sol";
 import "../ownership/ownable.sol";
@@ -20,7 +21,6 @@ contract NFTokenMetadataMock is
     string memory _name,
     string memory _symbol
   )
-    public
   {
     nftName = _name;
     nftSymbol = _symbol;

src/contracts/mocks/nf-token-metadata-enumerable-mock.sol

@@ -1,4 +1,5 @@
-pragma solidity 0.6.2;
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.0;
 
 import "../../contracts/tokens/nf-token.sol";
 import "../ownership/ownable.sol";