update change log

9 jobs for iterators in 6 minutes and 26 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #77331
VS2015
VS2015-32-bit

00:01:13

passed #77330
VS2015
VS2015-64-bit

00:01:26

passed #77329
VS2017
VS2017-32-bit

00:01:16

passed #77328
VS2015
VS2017-64-bit

00:01:25

passed #77325
Linux
clang-c++11

00:06:25

passed #77327
Linux
cppcheck

00:03:32

passed #77332
Linux
doc

00:00:22

passed #77324
Linux
gcc-c++11

00:04:00

passed #77326
Apple
macos-c++11

00:03:09