Update README.md (simolus3#227)

Author: purplenoodlesoop

README.md

@@ -28,7 +28,7 @@ import 'package:web3dart/web3dart.dart';
 Credentials fromHex = EthPrivateKey.fromHex("c87509a[...]dc0d3");
 
 // Or generate a new key randomly
-var rng = new Random.secure();
+var rng = Random.secure();
 Credentials random = EthPrivateKey.createRandom(random)(rng);
 
 // In either way, the library can derive the public key and the address
@@ -45,7 +45,7 @@ support for version 3 wallets commonly generated by other Ethereum clients:
 import 'dart:io';
 import 'package:web3dart/web3dart.dart';
 
-String content = new File("wallet.json").readAsStringSync();
+String content = File("wallet.json").readAsStringSync();
 Wallet wallet = Wallet.fromJson(content, "testpassword");
 
 Credentials unlocked = wallet.privateKey;
@@ -80,8 +80,8 @@ import 'package:web3dart/web3dart.dart';
 
 var apiUrl = "http://localhost:7545"; //Replace with your API
 
-var httpClient = new Client();
-var ethClient = new Web3Client(apiUrl, httpClient);
+var httpClient = Client();
+var ethClient = Web3Client(apiUrl, httpClient);
 
 var credentials = ethClient.credentialsFromPrivateKey("0x...");
 
@@ -98,7 +98,7 @@ transactions:
 import 'package:web3dart/web3dart.dart';
 
 /// [...], you need to specify the url and your client, see example above
-var ethClient = new Web3Client(apiUrl, httpClient);
+var ethClient = Web3Client(apiUrl, httpClient);
 
 var credentials = ethClient.credentialsFromPrivateKey("0x...");