Add --dnsslowrate arg

acme.sh

@@ -3974,10 +3974,17 @@ $_authorizations_map"
             return 1
           fi
 
+          if [ "$addcommand" = "dns_aws_add" -a -n "$_dnsslowrate" ] ; then
+            if ! $addcommand "$txtdomain" "$txt" "$_dnsslowrate"; then
+              _err "Error add txt for domain:$txtdomain"
+              return 1
+            fi
+          else
             if ! $addcommand "$txtdomain" "$txt"; then
               _err "Error add txt for domain:$txtdomain"
               return 1
             fi
+          fi
         )
 
         if [ "$?" != "0" ]; then
@@ -5919,6 +5926,7 @@ _process() {
   _httpport=""
   _tlsport=""
   _dnssleep=""
+  _dnsslowrate=""
   _listraw=""
   _stopRenewOnError=""
   #_insecure=""
@@ -6158,6 +6166,12 @@ _process() {
           _webroot="$_webroot,$wvalue"
         fi
         ;;
+
+      --dnsslowrate)
+        _dnsslowrate="$2"
+        shift
+        ;;
+
       --dnssleep)
         _dnssleep="$2"
         Le_DNSSleep="$_dnssleep"