FEATURE: add support for categories into content save/edit

app/Models/Content.php

@@ -18,6 +18,7 @@ class Content extends Model
     protected $fillable = [
         'user_id',
         'parent_id',
+        'category_id',
         'language',
         'module_handler',
         'published_from',
@@ -260,7 +261,7 @@ class Content extends Model
 
             if (trim($fieldValue) != $request[$fieldRequest]) {
 
-                $this->saveHistory();
+                $this->saveHistory($revisionId, $fieldRequest, $fieldValue, $request);
 
                 // save change into database
                 if ($commonField) {