Use jetpack autoloader and composer instead of namespace rewrite

inc/managers/class-membership-manager.php

@@ -11,7 +11,7 @@
 
 namespace WP_Ultimo\Managers;
 
-use \WP_Ultimo\Dependencies\Psr\Log\LogLevel;
+use \Psr\Log\LogLevel;
 use \WP_Ultimo\Managers\Base_Manager;
 use \WP_Ultimo\Database\Memberships\Membership_Status;