Use dnsslowrate arg

dnsapi/dns_aws.sh

@@ -18,6 +18,7 @@ AWS_WIKI="https://github.com/Neilpang/acme.sh/wiki/How-to-use-Amazon-Route53-API
 dns_aws_add() {
   fulldomain=$1
   txtvalue=$2
+  slowrateslepp=$3
 
   AWS_ACCESS_KEY_ID="${AWS_ACCESS_KEY_ID:-$(_readaccountconf_mutable AWS_ACCESS_KEY_ID)}"
   AWS_SECRET_ACCESS_KEY="${AWS_SECRET_ACCESS_KEY:-$(_readaccountconf_mutable AWS_SECRET_ACCESS_KEY)}"
@@ -72,6 +73,10 @@ dns_aws_add() {
 
   if aws_rest POST "2013-04-01$_domain_id/rrset/" "" "$_aws_tmpl_xml" && _contains "$response" "ChangeResourceRecordSetsResponse"; then
     _info "TXT record updated successfully."
+    if [ -n "$slowrateslepp" ]; then
+      _info "Slow rate activated: sleeping for $slowrateslepp seconds"
+      sleep $slowrateslepp
+    fi
     return 0
   fi