Fix file write permission

Author: yllumi

src/Drivers/File.php

@@ -78,7 +78,7 @@ public function set(string $key, $value, ?int $ttl = 300)
 
         if ($this->write_file($this->file_path.$key, serialize($contents)))
         {
-            chmod($this->file_path.$key, 0640);
+            chmod($this->file_path.$key, 0755);
             return TRUE;
         }
 
@@ -253,4 +253,4 @@ private function delete_files($path, $del_dir = FALSE, $htdocs = FALSE, $_level
             ? @rmdir($path)
             : TRUE;
     }
-}
+}