Mention spl_object_id in UPGRADING notes

TysonAndre · krakjoe · commit 88e94a0bd14a · 2017-11-06T07:18:39.000Z
This was implemented in PR #2611
diff --git a/UPGRADING b/UPGRADING
@@ -268,6 +268,9 @@ See also: https://wiki.php.net/rfc/deprecations_php_7_2
   . Added socket_addrinfo_lookup(), socket_addrinfo_connect(),
     socket_addrinfo_bind() and socket_addrinfo_explain().
 
+- SPL:
+  . Added spl_object_id().
+
 ========================================
 7. New Classes and Interfaces
 ========================================
