Change visibility of Readability::loadHtml() to public

This change is required for usecases where we want to load the DOM
without going through the whole init() process

Related to https://github.com/j0k3r/graby/pull/392

Signed-off-by: Kevin Decherf <kevin@kdecherf.com>

src/Readability.php

@@ -1380,7 +1380,7 @@ class Readability implements LoggerAwareInterface
      * Apply Pre filters
      * Cleanup HTML using Tidy (or not).
      */
-    private function loadHtml(): void
+    public function loadHtml(): void
     {
         $this->original_html = $this->html;