Allow multiple accounts to coexist

[TanguyHerbron]

As I tried to work with multiple Binance accounts, I noticed, with the code following :

public static void main(String[] args) {
	  
	try {
	    BinanceApiClientFactory factory = BinanceApiClientFactory.newInstance("0000", "0000");
	    BinanceApiRestClient client = factory.newRestClient();

	    // Get account balances
	    Account account = client.getAccount(6000000L, System.currentTimeMillis());
	    System.out.println(account.getAssetBalance("VEN"));
	} catch(BinanceApiException e) {
		e.printStackTrace();
	}
    
	try {
	    BinanceApiClientFactory factory = BinanceApiClientFactory.newInstance("VALID API KEY", "VALID SECRET KEY");
	    BinanceApiRestClient client = factory.newRestClient();

	    // Get account balances
	    Account account = client.getAccount(6000000L, System.currentTimeMillis());
	    System.out.println(account.getAssetBalance("VEN"));
	} catch(BinanceApiException e) {
		e.printStackTrace();
	}
  }

• Situtation 1 : First account valid, second account incorrect
  Both requests returns informations from the first, valid, account
  The second account is considered as valid (call.execute() line 53 in BinanceApiServiceGenerator returns true for both cases)

• Situation 2 : First account incorrect, second account valid
  Behaves as intended, the first one throws an exception, the second one returns the balance present on the account

• Situation 3 : Both accounts valid but from different Binance accounts
  Not tested

The modifications I propose allows the above code to detect an invalid account no matter the order its called.

I tried to read and understand the code as much as I could but I might have done something wrong, in this case I'm curious to know what and why.

Hope I'll hear news from you.

[joaopsilva]

Fixed in #133.

[joaopsilva]

Fixed in #133.