Merge pull request #43 from spaze/spaze/stop-using-this

Trigger a notice because some folks are still using the package, Packagist says

src/VatCalculator.php

@@ -37,6 +37,7 @@ class VatCalculator
 
 	public function __construct(VatRates $vatRates, ?string $businessCountryCode = null, ?string $businessVatNumber = null, ?float $timeout = null)
 	{
+		trigger_error('Hi, please stop using spaze/vat-calculator, it is not supported anymore, the VAT rates may be incorrect. Use https://github.com/driesvints/vat-calculator and for more info see https://github.com/spaze/vat-calculator/releases/tag/v3.6.6', E_USER_NOTICE);
 		$this->vatRates = $vatRates;
 		if ($businessCountryCode) {
 			$this->setBusinessCountryCode($businessCountryCode);