Add new function hash_pbkdf2() to UGRAPDING doc

diff --git a/UPGRADING b/UPGRADING
index 77fe97257d476a54f9f211cb8a66385e15d1c02b..8b52be26d75c0b8c98d1766066b0cb8ac3bb74d5 100755 (executable)
--- a/UPGRADING
+++ b/UPGRADING
@@ -97,6 +97,9 @@ PHP X.Y UPGRADE NOTES
 - Core:
   - boolval()
 
+- Hash:
+  - hash_pbkdf2()
+
 - Intl:
   - datefmt_get_calendar_object()
   - datefmt_get_timezone()