update HISTORY

diff --git a/HISTORY b/HISTORY
index aafb140bf4901a00976a9ebfda111c18a60fe7d4..91675e9fed6d575c42668ebec4ab6f3d226db9a4 100644 (file)
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,7 @@
 History
 
+2017/08/30: Version 6.6.1
+
 2017/08/29: fix definition of \X to (?>\O(?:\Y\O)*)
 
 2017/08/28: Version 6.6.0