Update to v2 server

gen-cert.sh

@@ -97,7 +97,7 @@ done
 
 
 ${LEBINARY} ${email} \
-        --server https://acme-v01.api.letsencrypt.org/directory \
+        --server https://acme-v02.api.letsencrypt.org/directory \
         --agree-tos \
         --renew-by-default \
         ${AUTH} \

gen-unifi-cert.sh

@@ -105,7 +105,7 @@ fi
 
 if [[ ${onlyinsert} != "yes" ]]; then
   echo "Firing up standalone authenticator on TCP port 80 and requesting cert..."
-  ${LEBINARY} --server https://acme-v01.api.letsencrypt.org/directory \
+  ${LEBINARY} --server https://acme-v02.api.letsencrypt.org/directory \
               --agree-tos --standalone --preferred-challenges http ${LEOPTIONS}
 fi