Update UPGRADING according to bug fix

diff --git a/UPGRADING b/UPGRADING
index faf66d1ba4d785253848fb13412829886d1c7f3c..7a174c47c2a034ac3718cf364cde66569d72b0d7 100755 (executable)
--- a/UPGRADING
+++ b/UPGRADING
@@ -476,3 +476,5 @@ PHP 5.6 UPGRADE NOTES
     input_encoding
     output_encoding
 
+  The mb_regex_encoding() default setting is changed from EUC-JP to UTF-8.
+