MINT-5364: Add function shiftUp

Author: Jason Machado Silva

Tools/Mapper/Mapper.php

@@ -194,6 +194,16 @@ public function first(array $array)
         return reset($array);
     }
 
+    /**
+     * @param array $elements
+     *
+     * @return array
+     */
+    public function shiftUp(array $elements)
+    {
+        return array_merge(...$elements);
+    }
+
     /**
      * Convert a string to date.
      *