only POST new/changed data to the API when saving (#2)

src/GiteaData.php

@@ -4,8 +4,10 @@ namespace JHodges\GiteaBot;
 class GiteaData{
 
   protected $data=null;
+  protected $newData=null;
 
   public function __construct($data=null){
+    $this->newData=new stdClass();
     if(!$data){
       $data=new stdClass();
     }
@@ -14,6 +16,7 @@ class GiteaData{
 
   public function __set($k,$v){
     $this->data->$k=$v;
+    $this->newData->$k=$v;
   }
 
   public function __get($k){