Update readme file, Update composer.json file, Exception updates

Alle exceptions thrown in Response are now general AmazonError with json
return string for full compability

src/Response/CreateResponse.php

@@ -2,6 +2,7 @@
 
 namespace gullevek\AmazonIncentives\Response;
 
+use gullevek\AmazonIncentives\Exceptions\AmazonErrors;
 use gullevek\AmazonIncentives\Debug\AmazonDebug;
 
 class CreateResponse
@@ -168,7 +169,13 @@ class CreateResponse
 	public function parseJsonResponse(array $json_response): self
 	{
 		if (!is_array($json_response)) {
-			throw new \RuntimeException('Response must be a scalar value');
+			throw AmazonErrors::getError(
+				'FAILURE',
+				'E001',
+				'NonScalarValue',
+				'Response must be a scalar value',
+				0
+			);
 		}
 		if (array_key_exists('gcId', $json_response)) {
 			$this->id = $json_response['gcId'];