gandi_livedns: use PUT instead of POST for creating DNS record

dnsapi/dns_gandi_livedns.sh

@@ -36,7 +36,7 @@ dns_gandi_livedns_add() {
   _debug domain "$_domain"
   _debug sub_domain "$_sub_domain"
 
-  _gandi_livedns_rest POST "domains/$_domain/records/$_sub_domain/TXT" "{\"rrset_ttl\": 300, \"rrset_values\":[\"$txtvalue\"]}"
+  _gandi_livedns_rest PUT "domains/$_domain/records/$_sub_domain/TXT" "{\"rrset_ttl\": 300, \"rrset_values\":[\"$txtvalue\"]}"
 
   return $?
 }