MDL-37429 document zip packer improvements

diff --git a/lib/upgrade.txt b/lib/upgrade.txt
index 783300b..f5d3c5a 100644 (file)
--- a/lib/upgrade.txt
+++ b/lib/upgrade.txt
@@ -1,6 +1,11 @@
 This files describes API changes in core lbraries and APIs,
 information provided here is intended especially for developers.
 
+=== 2.5 ===
+
+* zip_packer may create empty zip archives, there is a new option to ignore
+  problematic files when creating archive
+
 === 2.4 ===
 
 * Pagelib: Numerous deprecated functions were removed as classes page_base, page_course