fix: remove hardcoded gasPrice and gasLimit (#753)

examples/hardhat/deploy/ERC20.deploy.js

@@ -10,8 +10,6 @@ const func = async (hre) => {
   await deploy('ERC20', {
     from: deployer,
     args: [initialSupply, name],
-    gasPrice: hre.ethers.BigNumber.from('0'),
-    gasLimit: 8999999,
     log: true
   })
 }

examples/hardhat/test/erc20.test.js

@@ -18,7 +18,7 @@ describe(`ERC20`, () => {
     const Factory__ERC20 = await ethers.getContractFactory('ERC20')
     ERC20 = await Factory__ERC20.connect(account1).deploy(
       INITIAL_SUPPLY,
-      TOKEN_NAME,
+      TOKEN_NAME
     )
 
     await ERC20.deployTransaction.wait()