Clarify point about lacking change log standard.
Clarify point about lacking change log standard.

Yes, we know there's a GNU style guide for change logs:
https://github.com/olivierlacan/keep-a-changelog/issues/2

It's not good enough. Or people simply don't know about it because
the GNU style guide has poor or inexistent examples and is far too
naive to be applied in many situations.

cogmission/keep-a-changelog,hunan-rostomyan/keep-a-changelog,ginovva320/keep-a-changelog,vmlinz/keep-a-changelog,cogmission/keep-a-changelog,metavida/keep-a-changelog,ginovva320/keep-a-changelog,suhyunjeon/keep-a-changelog,tianshuo/keep-a-changelog,metavida/keep-a-changelog,vmlinz/keep-a-changelog,assispedro/keep-a-changelog,tianshuo/keep-a-changelog,skarekrow/keep-a-changelog,czeeb/keep-a-changelog,suhyunjeon/keep-a-changelog,hunan-rostomyan/keep-a-changelog,bstroebl/keep-a-changelog,skarekrow/keep-a-changelog,bstroebl/keep-a-changelog,tianshuo/keep-a-changelog,assispedro/keep-a-changelog,czeeb/keep-a-changelog