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Google Exchanger Error

Describe the bug

	SwapTest := swap.NewSwap()

	SwapTest.
		AddExchanger(ex.NewGoogleApi(nil)).
		AddExchanger(ex.NewYahooApi(nil)).
		Build()

	euroToUsdRate := SwapTest.Latest("EUR/USD")
	fmt.Println(euroToUsdRate.GetRateValue())
	fmt.Println(euroToUsdRate.GetRateDateTime())
	fmt.Println(euroToUsdRate.GetExchangerName())

I tried to run the example from the repo and got this error.

=== RUN   TestCurrencyExchange2
--- FAIL: TestCurrencyExchange2 (0.83s)
panic: runtime error: index out of range [2] with length 0 [recovered]
	panic: runtime error: index out of range [2] with length 0

goroutine 6 [running]:
testing.tRunner.func1.1(0x1321400, 0xc0003d2160)
	/usr/local/Cellar/go/1.15/libexec/src/testing/testing.go:1057 +0x30d
testing.tRunner.func1(0xc000001b00)
	/usr/local/Cellar/go/1.15/libexec/src/testing/testing.go:1060 +0x41a
panic(0x1321400, 0xc0003d2160)
	/usr/local/Cellar/go/1.15/libexec/src/runtime/panic.go:969 +0x175
github.com/me-io/go-swap/pkg/exchanger.(*googleApi).Latest(0xc00014e100, 0x13419ec, 0x3, 0x13419f0, 0x3, 0xc00015c160, 0x1, 0x1, 0x2, 0x1342631)
	/Volumes/Data/go/pkg/mod/github.com/me-io/[email protected]/pkg/exchanger/google.go:97 +0x353
github.com/me-io/go-swap/pkg/swap.(*Swap).Latest(0xc000040748, 0x13419ec, 0x7, 0x1, 0x2)
	/Volumes/Data/go/pkg/mod/github.com/me-io/[email protected]/pkg/swap/swap.go:45 +0x194
github.com/thaitanloi365/swop-backend/tests.TestCurrencyExchange2(0xc000001b00)
	/Volumes/Data/Projects/swop-backend/tests/currency_test.go:21 +0x151
testing.tRunner(0xc000001b00, 0x135b4e8)
	/usr/local/Cellar/go/1.15/libexec/src/testing/testing.go:1108 +0xef
created by testing.(*T).Run
	/usr/local/Cellar/go/1.15/libexec/src/testing/testing.go:1159 +0x386

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