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
When creating OVH API credentials, one can scope them to a specific subset of routes. Specifically, this allows to limit acme.sh to a specific zone as the zone is part of the URL. This is an important security/safety net feature.