Modify host to mainnet

Author: Fenguoz

README.md

@@ -33,7 +33,8 @@ composer require fenguoz/tron-php
 ``` php
 use GuzzleHttp\Client;
 
-$uri = 'https://api.shasta.trongrid.io';// shasta testnet
+$uri = 'https://api.trongrid.io';// mainnet
+// $uri = 'https://api.shasta.trongrid.io';// shasta testnet
 $api = new \Tron\Api(new Client(['base_uri' => $uri]));
 
 $trxWallet = new \Tron\TRX($api);

tests/TRC20Test.php

@@ -20,7 +20,8 @@
 
 class TRC20Test extends TestCase
 {
-    const URI = 'https://api.shasta.trongrid.io'; // shasta testnet
+    const URI = 'https://api.trongrid.io'; // mainnet
+    // const URI = 'https://api.shasta.trongrid.io'; // shasta testnet
     const ADDRESS = 'TGytofNKuSReFmFxsgnNx19em3BAVBTpVB';
     const PRIVATE_KEY = '0xf1b4b7d86a3eff98f1bace9cb2665d0cad3a3f949bc74a7ffb2aaa968c07f521';
     const BLOCK_ID = 13402554;