Use stable gandi API url

The gandi api has changed its url for a more stable
one. Although https://dns.beta.gandi.net will continue to 
work for the foreseable future, this commits updates the
url to new official one.

dnsapi/dns_gandi_livedns.sh

@@ -11,7 +11,7 @@
 #
 ########  Public functions #####################
 
-GANDI_LIVEDNS_API="https://dns.beta.gandi.net/api/v5"
+GANDI_LIVEDNS_API="https://dns.api.gandi.net/api/v5"
 
 #Usage: dns_gandi_livedns_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
 dns_gandi_livedns_add() {