use strict comparison when searching for a node's child (#86)

Co-authored-by: Alex Michelet <[email protected]>

Author: alexmichelet

JBBCode/ElementNode.php

@@ -185,7 +185,7 @@ public function addChild(Node $child)
     public function removeChild(Node $child)
     {
         foreach ($this->children as $key => $value) {
-            if ($value == $child) {
+            if ($value === $child) {
                 unset($this->children[$key]);
             }
         }