added NEWS entry

Author: jorgsowa

NEWS

@@ -97,6 +97,8 @@ PHP                                                                        NEWS
 - Standard:
   . Fixed bug GH-19926 (reset internal pointer earlier while splicing array
     while COW violation flag is still set). (alexandre-daubois)
+  . Invalid mode values now throw in array_filter() instead of being silently
+    defaulted to 0. (Jorg Sowa)
 
 - Streams:
   . Added so_keepalive, tcp_keepidle, tcp_keepintvl and tcp_keepcnt stream