export altnames so it can be used in hook scripts (fixes #360)

dehydrated

@@ -513,6 +513,7 @@ sign_csr() {
   if [ -z "${altnames}" ]; then
     altnames="$( extract_altnames "${csr}" )"
   fi
+  export altnames
 
   if [[ -z "${CA_NEW_AUTHZ}" ]] || [[ -z "${CA_NEW_CERT}" ]]; then
     _exiterr "Certificate authority doesn't allow certificate signing"
@@ -715,6 +716,8 @@ sign_domain() {
   altnames="${*}"
   timestamp="$(date +%s)"
 
+  export altnames
+
   echo " + Signing domains..."
   if [[ -z "${CA_NEW_AUTHZ}" ]] || [[ -z "${CA_NEW_CERT}" ]]; then
     _exiterr "Certificate authority doesn't allow certificate signing"