[master] 8c0c414f0 Document VRT 18.1 change

[Nils Goroll]

commit 8c0c414f0631ff4cc1bc7324b691a2114b119130
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Thu Dec 7 14:18:44 2023 +0100

    Document VRT 18.1 change
    
    Ref 5583667fedcb969d112b17fdb4d84f2e910e75fe
    Ref #4013

diff --git a/include/vrt.h b/include/vrt.h
index b378920a2..fe292e3ce 100644
--- a/include/vrt.h
+++ b/include/vrt.h
@@ -58,6 +58,8 @@
  * binary/load-time compatible, increment MAJOR version
  *
  * NEXT (2024-03-15)
+ * 18.1 (2023-12-05)
+ *	vbf_objiterate() implementation changed #4013
  * 18.0 (2023-09-15)
  *	[cache_filter.h] struct vdp gained priv1 member
  *	VRT_trace() added