Historical note in ChangeLog

I keep looking here to find out when I started requiring C++-11, and
now I will find the answer in the first place I look.

1 files changed, 2 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 10407aa2..45e9575b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -99,6 +99,8 @@
 
 	* 9.1.0: release
 
+	* This is the first version of qpdf that requires C++-11.
+
 2019-11-09  Jay Berkenbilt  <ejb@ql.org>
 
 	* 9.1.rc1: release