Update solidity compiler version

contracts/Token.sol

@@ -2,12 +2,11 @@
 
 // Solidity files have to start with this pragma.
 // It will be used by the Solidity compiler to validate its version.
-pragma solidity ^0.7.0;
+pragma solidity ^0.8.0;
 
 // We import this library to be able to use console.log
 import "hardhat/console.sol";
 
-
 // This is the main building block for smart contracts.
 contract Token {
     // Some string type variables to identify the token.

hardhat.config.js

@@ -6,5 +6,42 @@ require("@nomiclabs/hardhat-waffle");
 require("./tasks/faucet");
 
 module.exports = {
-  solidity: "0.7.3"
+  // solidity: "0.7.3",
+  solidity: "0.8.0",
+  networks: {
+    hardhat: {
+      chainId: 1337, // default: 31337 - metamask chain id issue - https://hardhat.org/metamask-issue.html
+    },
+    localhost: {
+      url: "http://localhost:8545",
+      chainId: 1337,
+    },
+  },
+  rinkeby: {
+    chainId: 4,
+    url: process.env.ALCHEMY_RINKEBY_RPC_URL,
+    accounts: [process.env.RINKEBY_PRIVATE_KEY],
+  },
+  kovan: {
+    chainId: 42,
+    url: process.env.ALCHEMY_KOVAN_RPC_URL,
+    accounts: [process.env.KOVAN_PRIVATE_KEY],
+    saveDeployments: true,
+  },
+  mumbai: {
+    // polygon testnet
+    chainId: 80001,
+    url: process.env.ALCHEMY_MUMBAI_RPC_URL,
+    accounts: [process.env.MUMBAI_PRIVATE_KEY],
+  },
+  polygon: {
+    chainId: 137,
+    url: process.env.ALCHEMY_POLYGON_RPC_URL,
+    accounts: [process.env.POLYGON_PRIVATE_KEY],
+  },
+  ethereum: {
+    chainId: 1,
+    url: process.env.ALCHEMY_RINKEBY_RPC_URL,
+    accounts: [process.env.RINKEBY_PRIVATE_KEY],
+  },
 };