Add nullable for size and from methods (ongr-io#301)

Author: PascalThesing

src/Search.php

@@ -458,15 +458,15 @@ public function getSuggests()
     }
 
     /**
-     * @return int
+     * @return null|int
      */
     public function getFrom()
     {
         return $this->from;
     }
 
     /**
-     * @param int $from
+     * @param null|int $from
      *
      * @return $this
      */
@@ -498,15 +498,15 @@ public function setTrackTotalHits(bool $trackTotalHits)
     }
 
     /**
-     * @return int
+     * @return null|int
      */
     public function getSize()
     {
         return $this->size;
     }
 
     /**
-     * @param int $size
+     * @param null|int $size
      *
      * @return $this
      */