fix https://github.com/Neilpang/acme.sh/issues/939
Add 'dns_dyn' DNS challenge validation script for Dyn Managed DNS API, Issue #594
dns_dyn.sh, remove empty line at end dns_dyn.sh, remove trailing spaces at end of line Replace 'head -n' with the '_head_n' function Update main README.md DNS API list
minor, fix format
Dev
don't trigger validation for dns manually mode
Fix for Name.com API