improve exception throwing with custom exception and use of code

src/ApiException.php

@@ -0,0 +1,10 @@
+<?php
+namespace JHodges\GiteaBot;
+
+class ApiException extends \Exception{
+
+    public function __toString() {
+        return __CLASS__ . ": [{$this->code}]: {$this->message}\n";
+    }
+
+}

src/Client.php

@@ -54,7 +54,7 @@ class Client{
 		if(in_array($status_code,[200,201,204])){
 			return json_decode($result);
 		}else{
-			throw new \Exception("API $status_code Code: ".$result);
+			throw new ApiException($result,$status_code);
 		}
 	}